19123023121 has 12 divisors (see below), whose sum is σ = 20637202572. Its totient is φ = 17658507776.

The previous prime is 19123023097. The next prime is 19123023169. The reversal of 19123023121 is 12132032191.

It can be written as a sum of positive squares in 6 ways, for example, as 336208896 + 18786814225 = 18336^2 + 137065^2 .

It is not a de Polignac number, because 19123023121 - 2⁵ = 19123023089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19123023221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152476 + ... + 247981.

It is an arithmetic number, because the mean of its divisors is an integer number (1719766881).

Almost surely, 2^19123023121 is an apocalyptic number.

It is an amenable number.

19123023121 is a deficient number, since it is larger than the sum of its proper divisors (1514179451).

19123023121 is an equidigital number, since it uses as much as digits as its factorization.

19123023121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400580 (or 400527 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 19123023121 in words is "nineteen billion, one hundred twenty-three million, twenty-three thousand, one hundred twenty-one".