21863881830 has 48 divisors (see below), whose sum is σ = 61040392560. Its totient is φ = 4997458368.

The previous prime is 21863881807. The next prime is 21863881843. The reversal of 21863881830 is 3818836812.

It is a self number, because there is not a number n which added to its sum of digits gives 21863881830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7435225 + ... + 7438164.

It is an arithmetic number, because the mean of its divisors is an integer number (1271674845).

Almost surely, 2^21863881830 is an apocalyptic number.

21863881830 is an abundant number, since it is smaller than the sum of its proper divisors (39176510730).

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

21863881830 is a wasteful number, since it uses less digits than its factorization.

21863881830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14873413 (or 14873406 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 21863881830 in words is "twenty-one billion, eight hundred sixty-three million, eight hundred eighty-one thousand, eight hundred thirty".