21298053904 has 20 divisors (see below), whose sum is σ = 41268604300. Its totient is φ = 10648091520.

The previous prime is 21298053877. The next prime is 21298053913. The reversal of 21298053904 is 40935089212.

It can be written as a sum of positive squares in 2 ways, for example, as 17436674304 + 3861379600 = 132048^2 + 62140^2 .

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, 152422 + ... + 256570.

It is an arithmetic number, because the mean of its divisors is an integer number (2063430215).

Almost surely, 2^21298053904 is an apocalyptic number.

It is an amenable number.

21298053904 is a deficient number, since it is larger than the sum of its proper divisors (19970550396).

21298053904 is a wasteful number, since it uses less digits than its factorization.

21298053904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116938 (or 116932 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 21298053904 in words is "twenty-one billion, two hundred ninety-eight million, fifty-three thousand, nine hundred four".