21040015052 has 12 divisors (see below), whose sum is σ = 42080030160. Its totient is φ = 9017149296.

The previous prime is 21040015033. The next prime is 21040015067. The reversal of 21040015052 is 25051004012.

21040015052 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375714527 + ... + 375714582.

It is an arithmetic number, because the mean of its divisors is an integer number (3506669180).

Almost surely, 2^21040015052 is an apocalyptic number.

It is an amenable number.

21040015052 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21040015052 is a wasteful number, since it uses less digits than its factorization.

21040015052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751429120 (or 751429118 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 21040015052 its reverse (25051004012), we get a palindrome (46091019064).

The spelling of 21040015052 in words is "twenty-one billion, forty million, fifteen thousand, fifty-two".