21112031599 has 2 divisors, whose sum is σ = 21112031600. Its totient is φ = 21112031598.

The previous prime is 21112031561. The next prime is 21112031693. The reversal of 21112031599 is 99513021112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112031599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112031509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556015799 + 10556015800.

It is an arithmetic number, because the mean of its divisors is an integer number (10556015800).

Almost surely, 2^21112031599 is an apocalyptic number.

21112031599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112031599 is an equidigital number, since it uses as much as digits as its factorization.

21112031599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 34.

The spelling of 21112031599 in words is "twenty-one billion, one hundred twelve million, thirty-one thousand, five hundred ninety-nine".