20211131999 has 6 divisors (see below), whose sum is σ = 20716111440. Its totient is φ = 19718175920.

The previous prime is 20211131977. The next prime is 20211132037. The reversal of 20211131999 is 99913111202.

It is not a de Polignac number, because 20211131999 - 2²⁴ = 20194354783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211131959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6009959 + ... + 6013320.

It is an arithmetic number, because the mean of its divisors is an integer number (3452685240).

Almost surely, 2^20211131999 is an apocalyptic number.

20211131999 is a deficient number, since it is larger than the sum of its proper divisors (504979441).

20211131999 is an equidigital number, since it uses as much as digits as its factorization.

20211131999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12023361 (or 12023320 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 20211131999 in words is "twenty billion, two hundred eleven million, one hundred thirty-one thousand, nine hundred ninety-nine".