21202110009999 has 24 divisors (see below), whose sum is σ = 31321489447872. Its totient is φ = 13814265998400.

The previous prime is 21202110009991. The next prime is 21202110010009. The reversal of 21202110009999 is 99990001120212.

It is not a de Polignac number, because 21202110009999 - 2³ = 21202110009991 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202110009991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35454684 + ... + 36047729.

It is an arithmetic number, because the mean of its divisors is an integer number (1305062060328).

Almost surely, 2^{21202110009999} is an apocalyptic number.

21202110009999 is a deficient number, since it is larger than the sum of its proper divisors (10119379437873).

21202110009999 is a wasteful number, since it uses less digits than its factorization.

21202110009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71503167 (or 71503164 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 21202110009999 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, nine thousand, nine hundred ninety-nine".