21523855832512 has 28 divisors (see below), whose sum is σ = 46594256093496. Its totient is φ = 9783570832640.

The previous prime is 21523855832503. The next prime is 21523855832513.

21523855832512 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21523855832512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523855832513) 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, 15286828723 + ... + 15286830130.

Almost surely, 2^{21523855832512} is an apocalyptic number.

21523855832512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21523855832512 is an abundant number, since it is smaller than the sum of its proper divisors (25070400260984).

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

21523855832512 is a wasteful number, since it uses less digits than its factorization.

21523855832512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30573658876 (or 30573658866 counting only the distinct ones).

The product of its digits is 5760000, while the sum is 52.

It can be divided in two parts, 2152385 and 5832512, that added together give a palindrome (7984897).

The spelling of 21523855832512 in words is "twenty-one trillion, five hundred twenty-three billion, eight hundred fifty-five million, eight hundred thirty-two thousand, five hundred twelve".