30972373221 has 4 divisors (see below), whose sum is σ = 41296497632. Its totient is φ = 20648248812.

The previous prime is 30972373213. The next prime is 30972373279. The reversal of 30972373221 is 12237327903.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 30972373221 - 2³ = 30972373213 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 30972373221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30972373021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5162062201 + ... + 5162062206.

It is an arithmetic number, because the mean of its divisors is an integer number (10324124408).

Almost surely, 2^30972373221 is an apocalyptic number.

It is an amenable number.

30972373221 is a deficient number, since it is larger than the sum of its proper divisors (10324124411).

30972373221 is a wasteful number, since it uses less digits than its factorization.

30972373221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324124410.

The product of its (nonzero) digits is 95256, while the sum is 39.

The spelling of 30972373221 in words is "thirty billion, nine hundred seventy-two million, three hundred seventy-three thousand, two hundred twenty-one".