3111216979621 has 32 divisors (see below), whose sum is σ = 3225166560000. Its totient is φ = 2999482472448.

The previous prime is 3111216979613. The next prime is 3111216979681. The reversal of 3111216979621 is 1269796121113.

It is not a de Polignac number, because 3111216979621 - 2³ = 3111216979613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3111216979681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 753501685 + ... + 753505813.

It is an arithmetic number, because the mean of its divisors is an integer number (100786455000).

Almost surely, 2^{3111216979621} is an apocalyptic number.

It is an amenable number.

3111216979621 is a deficient number, since it is larger than the sum of its proper divisors (113949580379).

3111216979621 is a wasteful number, since it uses less digits than its factorization.

3111216979621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053.

The product of its digits is 244944, while the sum is 49.

The spelling of 3111216979621 in words is "three trillion, one hundred eleven billion, two hundred sixteen million, nine hundred seventy-nine thousand, six hundred twenty-one".