21080512 has 28 divisors (see below), whose sum is σ = 43653456. Its totient is φ = 10081280.

The previous prime is 21080509. The next prime is 21080533. The reversal of 21080512 is 21508012.

It is a super-3 number, since 3×21080512³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21080512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5689 + ... + 8632.

It is an arithmetic number, because the mean of its divisors is an integer number (1559052).

Almost surely, 2^21080512 is an apocalyptic number.

It is an amenable number.

21080512 is an abundant number, since it is smaller than the sum of its proper divisors (22572944).

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

21080512 is a wasteful number, since it uses less digits than its factorization.

21080512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14356 (or 14346 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 21080512 is about 4591.3518706368. The cubic root of 21080512 is about 276.2445497584.

Adding to 21080512 its reverse (21508012), we get a palindrome (42588524).

The spelling of 21080512 in words is "twenty-one million, eighty thousand, five hundred twelve".