21650651210052 has 18 divisors (see below), whose sum is σ = 54728035003278. Its totient is φ = 7216883736672.

The previous prime is 21650651210033. The next prime is 21650651210137. The reversal of 21650651210052 is 25001215605612.

21650651210052 is a `hidden beast` number, since 21 + 6 + 506 + 5 + 121 + 0 + 0 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17878487063616 + 3772164146436 = 4228296^2 + 1942206^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21650651210052² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 601406978057 = 21650651210052 / (2 + 1 + 6 + 5 + 0 + 6 + 5 + 1 + 2 + 1 + 0 + 0 + 5 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21650651209989 and 21650651210016.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 300703488993 + ... + 300703489064.

It is an arithmetic number, because the mean of its divisors is an integer number (3040446389071).

Almost surely, 2^{21650651210052} is an apocalyptic number.

It is an amenable number.

21650651210052 is an abundant number, since it is smaller than the sum of its proper divisors (33077383793226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21650651210052 is a wasteful number, since it uses less digits than its factorization.

21650651210052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601406978067 (or 601406978062 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 21650651210052 its reverse (25001215605612), we get a palindrome (46651866815664).

The spelling of 21650651210052 in words is "twenty-one trillion, six hundred fifty billion, six hundred fifty-one million, two hundred ten thousand, fifty-two".