21387005196 has 48 divisors (see below), whose sum is σ = 50344428288. Its totient is φ = 7066152000.

The previous prime is 21387005177. The next prime is 21387005221. The reversal of 21387005196 is 69150078312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 822531 + ... + 848133.

It is an arithmetic number, because the mean of its divisors is an integer number (1048842256).

Almost surely, 2^21387005196 is an apocalyptic number.

It is an amenable number.

21387005196 is an abundant number, since it is smaller than the sum of its proper divisors (28957423092).

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

21387005196 is a wasteful number, since it uses less digits than its factorization.

21387005196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26222 (or 26220 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 21387005196 in words is "twenty-one billion, three hundred eighty-seven million, five thousand, one hundred ninety-six".