21210022133221 has 4 divisors (see below), whose sum is σ = 21310543565344. Its totient is φ = 21109500701100.

The previous prime is 21210022133213. The next prime is 21210022133231. The reversal of 21210022133221 is 12233122001212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21210022133221 - 2³ = 21210022133213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210022133192 and 21210022133201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210022133231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50260715745 + ... + 50260716166.

It is an arithmetic number, because the mean of its divisors is an integer number (5327635891336).

Almost surely, 2^{21210022133221} is an apocalyptic number.

It is an amenable number.

21210022133221 is a deficient number, since it is larger than the sum of its proper divisors (100521432123).

21210022133221 is a wasteful number, since it uses less digits than its factorization.

21210022133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100521432122.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21210022133221 its reverse (12233122001212), we get a palindrome (33443144134433).

The spelling of 21210022133221 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, one hundred thirty-three thousand, two hundred twenty-one".