21253100255636 has 24 divisors (see below), whose sum is σ = 37318943589480. Its totient is φ = 10590558031872.

The previous prime is 21253100255599. The next prime is 21253100255641. The reversal of 21253100255636 is 63655200135212.

It can be written as a sum of positive squares in 4 ways, for example, as 1174635445636 + 20078464810000 = 1083806^2 + 4480900^2 .

It is a super-2 number, since 2×21253100255636² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21253100255593 and 21253100255602.

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, 4873460 + ... + 8139828.

It is an arithmetic number, because the mean of its divisors is an integer number (1554955982895).

Almost surely, 2^{21253100255636} is an apocalyptic number.

It is an amenable number.

21253100255636 is a deficient number, since it is larger than the sum of its proper divisors (16065843333844).

21253100255636 is a wasteful number, since it uses less digits than its factorization.

21253100255636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271883 (or 3271881 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 21253100255636 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred million, two hundred fifty-five thousand, six hundred thirty-six".