21136641630 has 64 divisors (see below), whose sum is σ = 55023252480. Its totient is φ = 5165421696.

The previous prime is 21136641629. The next prime is 21136641661. The reversal of 21136641630 is 3614663112.

It is a junction number, because it is equal to n+sod(n) for n = 21136641591 and 21136641600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140742 + ... + 249161.

It is an arithmetic number, because the mean of its divisors is an integer number (859738320).

Almost surely, 2^21136641630 is an apocalyptic number.

21136641630 is an abundant number, since it is smaller than the sum of its proper divisors (33886610850).

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

21136641630 is a wasteful number, since it uses less digits than its factorization.

21136641630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390065.

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 21136641630 in words is "twenty-one billion, one hundred thirty-six million, six hundred forty-one thousand, six hundred thirty".