21054661136 has 10 divisors (see below), whose sum is σ = 40793405982. Its totient is φ = 10527330560.

The previous prime is 21054661123. The next prime is 21054661141. The reversal of 21054661136 is 63116645012.

It can be written as a sum of positive squares in only one way, i.e., 20386128400 + 668532736 = 142780^2 + 25856^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21054661096 and 21054661105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657958145 + ... + 657958176.

Almost surely, 2^21054661136 is an apocalyptic number.

It is an amenable number.

21054661136 is a deficient number, since it is larger than the sum of its proper divisors (19738744846).

21054661136 is a wasteful number, since it uses less digits than its factorization.

21054661136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315916329 (or 1315916323 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21054661136 in words is "twenty-one billion, fifty-four million, six hundred sixty-one thousand, one hundred thirty-six".