20113123999 has 2 divisors, whose sum is σ = 20113124000. Its totient is φ = 20113123998.

The previous prime is 20113123969. The next prime is 20113124033. The reversal of 20113123999 is 99932131102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20113123999 - 2²¹ = 20111026847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20113123939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056561999 + 10056562000.

It is an arithmetic number, because the mean of its divisors is an integer number (10056562000).

Almost surely, 2^20113123999 is an apocalyptic number.

20113123999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20113123999 is an equidigital number, since it uses as much as digits as its factorization.

20113123999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 20113123999 in words is "twenty billion, one hundred thirteen million, one hundred twenty-three thousand, nine hundred ninety-nine".