21330203868 has 36 divisors (see below), whose sum is σ = 54523843920. Its totient is φ = 7030178496.

The previous prime is 21330203831. The next prime is 21330203893. The reversal of 21330203868 is 86830203312.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21330203868² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3325480 + ... + 3331887.

It is an arithmetic number, because the mean of its divisors is an integer number (1514551220).

Almost surely, 2^21330203868 is an apocalyptic number.

It is an amenable number.

21330203868 is an abundant number, since it is smaller than the sum of its proper divisors (33193640052).

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

21330203868 is a wasteful number, since it uses less digits than its factorization.

21330203868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657466 (or 6657461 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21330203868 in words is "twenty-one billion, three hundred thirty million, two hundred three thousand, eight hundred sixty-eight".