21256234524024 has 64 divisors (see below), whose sum is σ = 53694671536800. Its totient is φ = 7011550470144.

The previous prime is 21256234524011. The next prime is 21256234524029. The reversal of 21256234524024 is 42042543265212.

It is a super-2 number, since 2×21256234524024² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256234524029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19654804 + ... + 20708060.

Almost surely, 2^{21256234524024} is an apocalyptic number.

21256234524024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21256234524024 is an abundant number, since it is smaller than the sum of its proper divisors (32438437012776).

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

21256234524024 is a wasteful number, since it uses less digits than its factorization.

21256234524024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062032 (or 1062028 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 42.

Adding to 21256234524024 its reverse (42042543265212), we get a palindrome (63298777789236).

The spelling of 21256234524024 in words is "twenty-one trillion, two hundred fifty-six billion, two hundred thirty-four million, five hundred twenty-four thousand, twenty-four".