21215704152 has 64 divisors (see below), whose sum is σ = 56200723200. Its totient is φ = 6655305600.

The previous prime is 21215704141. The next prime is 21215704219. The reversal of 21215704152 is 25140751212.

It is a happy number.

It is a super-2 number, since 2×21215704152² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85203 + ... + 222914.

It is an arithmetic number, because the mean of its divisors is an integer number (878136300).

Almost surely, 2^21215704152 is an apocalyptic number.

It is an amenable number.

21215704152 is an abundant number, since it is smaller than the sum of its proper divisors (34985019048).

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

21215704152 is a wasteful number, since it uses less digits than its factorization.

21215704152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308296 (or 308292 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The spelling of 21215704152 in words is "twenty-one billion, two hundred fifteen million, seven hundred four thousand, one hundred fifty-two".