21387089196 has 54 divisors (see below), whose sum is σ = 58984544892. Its totient is φ = 6480054240.

The previous prime is 21387089153. The next prime is 21387089201. The reversal of 21387089196 is 69198078312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2906530 + ... + 2913878.

Almost surely, 2^21387089196 is an apocalyptic number.

It is an amenable number.

21387089196 is an abundant number, since it is smaller than the sum of its proper divisors (37597455696).

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

21387089196 is an equidigital number, since it uses as much as digits as its factorization.

21387089196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14719 (or 7365 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 21387089196 in words is "twenty-one billion, three hundred eighty-seven million, eighty-nine thousand, one hundred ninety-six".