19903190121 has 12 divisors (see below), whose sum is σ = 29676441600. Its totient is φ = 12840767640.

The previous prime is 19903190089. The next prime is 19903190173. The reversal of 19903190121 is 12109130991.

It is not a de Polignac number, because 19903190121 - 2⁵ = 19903190089 is a prime.

It is a super-2 number, since 2×19903190121² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19903190221) 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, 35668521 + ... + 35669078.

It is an arithmetic number, because the mean of its divisors is an integer number (2473036800).

Almost surely, 2^19903190121 is an apocalyptic number.

It is an amenable number.

19903190121 is a deficient number, since it is larger than the sum of its proper divisors (9773251479).

19903190121 is a wasteful number, since it uses less digits than its factorization.

19903190121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71337636 (or 71337633 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The spelling of 19903190121 in words is "nineteen billion, nine hundred three million, one hundred ninety thousand, one hundred twenty-one".