21513040555024 has 80 divisors (see below), whose sum is σ = 44251173457920. Its totient is φ = 10116170426880.

The previous prime is 21513040555009. The next prime is 21513040555043. The reversal of 21513040555024 is 42055504031512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 774352 + ... + 6604975.

It is an arithmetic number, because the mean of its divisors is an integer number (553139668224).

Almost surely, 2^{21513040555024} is an apocalyptic number.

It is an amenable number.

21513040555024 is an abundant number, since it is smaller than the sum of its proper divisors (22738132902896).

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

21513040555024 is a wasteful number, since it uses less digits than its factorization.

21513040555024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7379528 (or 7379522 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

Adding to 21513040555024 its reverse (42055504031512), we get a palindrome (63568544586536).

The spelling of 21513040555024 in words is "twenty-one trillion, five hundred thirteen billion, forty million, five hundred fifty-five thousand, twenty-four".