21113031399 has 32 divisors (see below), whose sum is σ = 29796747264. Its totient is φ = 13278695040.

The previous prime is 21113031377. The next prime is 21113031403. The reversal of 21113031399 is 99313031112.

It is not a de Polignac number, because 21113031399 - 2⁷ = 21113031271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113032399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 760212 + ... + 787494.

It is an arithmetic number, because the mean of its divisors is an integer number (931148352).

Almost surely, 2^21113031399 is an apocalyptic number.

21113031399 is a deficient number, since it is larger than the sum of its proper divisors (8683715865).

21113031399 is a wasteful number, since it uses less digits than its factorization.

21113031399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27527.

The product of its (nonzero) digits is 4374, while the sum is 33.

The spelling of 21113031399 in words is "twenty-one billion, one hundred thirteen million, thirty-one thousand, three hundred ninety-nine".