19291010121 has 12 divisors (see below), whose sum is σ = 28152059572. Its totient is φ = 12728088576.

The previous prime is 19291010111. The next prime is 19291010171. The reversal of 19291010121 is 12101019291.

It can be written as a sum of positive squares in 2 ways, for example, as 3706983225 + 15584026896 = 60885^2 + 124836^2 .

It is not a de Polignac number, because 19291010121 - 2²⁷ = 19156792393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19291010111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11047816 + ... + 11049561.

Almost surely, 2^19291010121 is an apocalyptic number.

It is an amenable number.

19291010121 is a deficient number, since it is larger than the sum of its proper divisors (8861049451).

19291010121 is a wasteful number, since it uses less digits than its factorization.

19291010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22097480 (or 22097477 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 19291010121 in words is "nineteen billion, two hundred ninety-one million, ten thousand, one hundred twenty-one".