19596920121 has 9 divisors (see below), whose sum is σ = 28307269029. Its totient is φ = 13064333436.

The previous prime is 19596920113. The next prime is 19596920141. The reversal of 19596920121 is 12102969591.

The square root of 19596920121 is 139989.

It is a perfect power (a square), and thus also a powerful number.

19596920121 is a `hidden beast` number, since 19 + 596 + 9 + 20 + 1 + 21 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 19596920121 - 2³ = 19596920113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19596920111) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 396636 + ... + 443298.

Almost surely, 2^19596920121 is an apocalyptic number.

19596920121 is the 139989-th square number.

19596920121 is the 69995-th centered octagonal number.

It is an amenable number.

19596920121 is a deficient number, since it is larger than the sum of its proper divisors (8710348908).

19596920121 is an frugal number, since it uses more digits than its factorization.

19596920121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93332 (or 46666 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The spelling of 19596920121 in words is "nineteen billion, five hundred ninety-six million, nine hundred twenty thousand, one hundred twenty-one".