21012577052 has 24 divisors (see below), whose sum is σ = 39197356800. Its totient is φ = 9827331696.

The previous prime is 21012577037. The next prime is 21012577063. The reversal of 21012577052 is 25077521012.

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, 1743878 + ... + 1755885.

It is an arithmetic number, because the mean of its divisors is an integer number (1633223200).

Almost surely, 2^21012577052 is an apocalyptic number.

It is an amenable number.

21012577052 is a deficient number, since it is larger than the sum of its proper divisors (18184779748).

21012577052 is a wasteful number, since it uses less digits than its factorization.

21012577052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499865 (or 3499863 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 32.

The spelling of 21012577052 in words is "twenty-one billion, twelve million, five hundred seventy-seven thousand, fifty-two".