21869051806 has 32 divisors (see below), whose sum is σ = 38338403328. Its totient is φ = 9162188640.

The previous prime is 21869051777. The next prime is 21869051887. The reversal of 21869051806 is 60815096812.

It is a congruent number.

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, 60651 + ... + 217753.

It is an arithmetic number, because the mean of its divisors is an integer number (1198075104).

Almost surely, 2^21869051806 is an apocalyptic number.

21869051806 is a deficient number, since it is larger than the sum of its proper divisors (16469351522).

21869051806 is a wasteful number, since it uses less digits than its factorization.

21869051806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157336.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 21869051806 in words is "twenty-one billion, eight hundred sixty-nine million, fifty-one thousand, eight hundred six".