21256234524010 has 16 divisors (see below), whose sum is σ = 38286918088200. Its totient is φ = 8496783599616.

The previous prime is 21256234523983. The next prime is 21256234524011. The reversal of 21256234524010 is 1042543265212.

It can be written as a sum of positive squares in 4 ways, for example, as 10558801823761 + 10697432700249 = 3249431^2 + 3270693^2 .

It is a super-2 number, since 2×21256234524010² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21256234524011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713760615 + ... + 713790394.

Almost surely, 2^{21256234524010} is an apocalyptic number.

21256234524010 is a deficient number, since it is larger than the sum of its proper divisors (17030683564190).

21256234524010 is a wasteful number, since it uses less digits than its factorization.

21256234524010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427552505.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 21256234524010 its reverse (1042543265212), we get a palindrome (22298777789222).

The spelling of 21256234524010 in words is "twenty-one trillion, two hundred fifty-six billion, two hundred thirty-four million, five hundred twenty-four thousand, ten".