21630109186 has 16 divisors (see below), whose sum is σ = 38358815040. Its totient is φ = 8950389840.

The previous prime is 21630109169. The next prime is 21630109247. The reversal of 21630109186 is 68190103612.

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, 26637660 + ... + 26638471.

It is an arithmetic number, because the mean of its divisors is an integer number (2397425940).

Almost surely, 2^21630109186 is an apocalyptic number.

21630109186 is a deficient number, since it is larger than the sum of its proper divisors (16728705854).

21630109186 is a wasteful number, since it uses less digits than its factorization.

21630109186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53276169.

The product of its (nonzero) digits is 15552, while the sum is 37.

It can be divided in two parts, 21630 and 109186, that added together give a triangular number (130816 = T₅₁₁).

The spelling of 21630109186 in words is "twenty-one billion, six hundred thirty million, one hundred nine thousand, one hundred eighty-six".