21112020999 has 12 divisors (see below), whose sum is σ = 30517369896. Its totient is φ = 14064421392.

The previous prime is 21112020971. The next prime is 21112021033. The reversal of 21112020999 is 99902021112.

It is not a de Polignac number, because 21112020999 - 2⁷ = 21112020871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112020959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 841897 + ... + 866610.

It is an arithmetic number, because the mean of its divisors is an integer number (2543114158).

Almost surely, 2^21112020999 is an apocalyptic number.

21112020999 is a deficient number, since it is larger than the sum of its proper divisors (9405348897).

21112020999 is a wasteful number, since it uses less digits than its factorization.

21112020999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709886 (or 1709883 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 21112020999 in words is "twenty-one billion, one hundred twelve million, twenty thousand, nine hundred ninety-nine".