21000202168 has 32 divisors (see below), whose sum is σ = 42979451760. Its totient is φ = 9540103680.

The previous prime is 21000202163. The next prime is 21000202169. The reversal of 21000202168 is 86120200012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000202163) 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, 89230 + ... + 223522.

Almost surely, 2^21000202168 is an apocalyptic number.

It is an amenable number.

21000202168 is an abundant number, since it is smaller than the sum of its proper divisors (21979249592).

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

21000202168 is a wasteful number, since it uses less digits than its factorization.

21000202168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136087 (or 136083 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 21000202168 in words is "twenty-one billion, two hundred two thousand, one hundred sixty-eight".