21831337668 has 48 divisors (see below), whose sum is σ = 61280952320. Its totient is φ = 5909233824.

The previous prime is 21831337667. The next prime is 21831337673. The reversal of 21831337668 is 86673313812.

It is not an unprimeable number, because it can be changed into a prime (21831337667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6837796 + ... + 6840987.

Almost surely, 2^21831337668 is an apocalyptic number.

21831337668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21831337668 is an abundant number, since it is smaller than the sum of its proper divisors (39449614652).

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

21831337668 is a wasteful number, since it uses less digits than its factorization.

21831337668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13678816 (or 13678814 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The spelling of 21831337668 in words is "twenty-one billion, eight hundred thirty-one million, three hundred thirty-seven thousand, six hundred sixty-eight".