21869697138 has 16 divisors (see below), whose sum is σ = 44017991040. Its totient is φ = 7243466256.

The previous prime is 21869697137. The next prime is 21869697139. The reversal of 21869697138 is 83179696812.

It is an interprime number because it is at equal distance from previous prime (21869697137) and next prime (21869697139).

It is not an unprimeable number, because it can be changed into a prime (21869697137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11607178 + ... + 11609061.

It is an arithmetic number, because the mean of its divisors is an integer number (2751124440).

Almost surely, 2^21869697138 is an apocalyptic number.

21869697138 is an abundant number, since it is smaller than the sum of its proper divisors (22148293902).

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

21869697138 is a wasteful number, since it uses less digits than its factorization.

21869697138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23216401.

The product of its digits is 7838208, while the sum is 60.

The spelling of 21869697138 in words is "twenty-one billion, eight hundred sixty-nine million, six hundred ninety-seven thousand, one hundred thirty-eight".