195236691021 has 48 divisors (see below), whose sum is σ = 288164283264. Its totient is φ = 127345502592.

The previous prime is 195236691017. The next prime is 195236691037. The reversal of 195236691021 is 120196632591.

195236691021 is a `hidden beast` number, since 19 + 523 + 6 + 6 + 9 + 102 + 1 = 666.

It is not a de Polignac number, because 195236691021 - 2² = 195236691017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195236698021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97763995 + ... + 97765991.

It is an arithmetic number, because the mean of its divisors is an integer number (6003422568).

Almost surely, 2^195236691021 is an apocalyptic number.

It is an amenable number.

195236691021 is a deficient number, since it is larger than the sum of its proper divisors (92927592243).

195236691021 is a wasteful number, since it uses less digits than its factorization.

195236691021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090 (or 3087 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 195236691021 in words is "one hundred ninety-five billion, two hundred thirty-six million, six hundred ninety-one thousand, twenty-one".