20123000999 has 2 divisors, whose sum is σ = 20123001000. Its totient is φ = 20123000998.

The previous prime is 20123000983. The next prime is 20123001007. The reversal of 20123000999 is 99900032102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20123000999 - 2⁴ = 20123000983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123900999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061500499 + 10061500500.

It is an arithmetic number, because the mean of its divisors is an integer number (10061500500).

Almost surely, 2^20123000999 is an apocalyptic number.

20123000999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123000999 is an equidigital number, since it uses as much as digits as its factorization.

20123000999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The spelling of 20123000999 in words is "twenty billion, one hundred twenty-three million, nine hundred ninety-nine", and thus it is an aban number.