21513355331512 has 32 divisors (see below), whose sum is σ = 44004822566400. Its totient is φ = 9778746296800.

The previous prime is 21513355331473. The next prime is 21513355331561.

21513355331512 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21513355331512² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19793337 + ... + 20851927.

It is an arithmetic number, because the mean of its divisors is an integer number (1375150705200).

Almost surely, 2^{21513355331512} is an apocalyptic number.

21513355331512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21513355331512 is an abundant number, since it is smaller than the sum of its proper divisors (22491467234888).

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

21513355331512 is a wasteful number, since it uses less digits than its factorization.

21513355331512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289547 (or 1289543 counting only the distinct ones).

The product of its digits is 202500, while the sum is 40.

It can be divided in two parts, 2151335 and 5331512, that added together give a palindrome (7482847).

The spelling of 21513355331512 in words is "twenty-one trillion, five hundred thirteen billion, three hundred fifty-five million, three hundred thirty-one thousand, five hundred twelve".