21112019999 has 12 divisors (see below), whose sum is σ = 25626659184. Its totient is φ = 17309232864.

The previous prime is 21112019977. The next prime is 21112020011. The reversal of 21112019999 is 99991021112.

It is not a de Polignac number, because 21112019999 - 2⁸ = 21112019743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112019909) 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, 9365342 + ... + 9367595.

It is an arithmetic number, because the mean of its divisors is an integer number (2135554932).

Almost surely, 2^21112019999 is an apocalyptic number.

21112019999 is a deficient number, since it is larger than the sum of its proper divisors (4514639185).

21112019999 is a wasteful number, since it uses less digits than its factorization.

21112019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18732974 (or 18732967 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 21112019999 in words is "twenty-one billion, one hundred twelve million, nineteen thousand, nine hundred ninety-nine".