31620677721 has 8 divisors (see below), whose sum is σ = 42224883360. Its totient is φ = 21048461952.

The previous prime is 31620677687. The next prime is 31620677723. The reversal of 31620677721 is 12777602613.

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

It is not a de Polignac number, because 31620677721 - 2¹¹ = 31620675673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31620677723) 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, 7995160 + ... + 7999113.

It is an arithmetic number, because the mean of its divisors is an integer number (5278110420).

Almost surely, 2^31620677721 is an apocalyptic number.

It is an amenable number.

31620677721 is a deficient number, since it is larger than the sum of its proper divisors (10604205639).

31620677721 is a wasteful number, since it uses less digits than its factorization.

31620677721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15994935.

The product of its (nonzero) digits is 148176, while the sum is 42.

The spelling of 31620677721 in words is "thirty-one billion, six hundred twenty million, six hundred seventy-seven thousand, seven hundred twenty-one".