192107189921 has 8 divisors (see below), whose sum is σ = 192217891560. Its totient is φ = 191996525952.

The previous prime is 192107189917. The next prime is 192107189941. The reversal of 192107189921 is 129981701291.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33333630625 + 158773559296 = 182575^2 + 398464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 192107189921 - 2² = 192107189917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 192107189921.

It is not an unprimeable number, because it can be changed into a prime (192107189941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23851331 + ... + 23859383.

It is an arithmetic number, because the mean of its divisors is an integer number (24027236445).

Almost surely, 2^192107189921 is an apocalyptic number.

It is an amenable number.

192107189921 is a deficient number, since it is larger than the sum of its proper divisors (110701639).

192107189921 is an equidigital number, since it uses as much as digits as its factorization.

192107189921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18835.

The product of its (nonzero) digits is 163296, while the sum is 50.

The spelling of 192107189921 in words is "one hundred ninety-two billion, one hundred seven million, one hundred eighty-nine thousand, nine hundred twenty-one".