21873131646616 has 8 divisors (see below), whose sum is σ = 41012121837420. Its totient is φ = 10936565823304.

The previous prime is 21873131646593. The next prime is 21873131646661. The reversal of 21873131646616 is 61664613137812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1367070727906 + ... + 1367070727921.

Almost surely, 2^{21873131646616} is an apocalyptic number.

It is an amenable number.

21873131646616 is a deficient number, since it is larger than the sum of its proper divisors (19138990190804).

21873131646616 is a wasteful number, since it uses less digits than its factorization.

21873131646616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734141455833 (or 2734141455829 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The spelling of 21873131646616 in words is "twenty-one trillion, eight hundred seventy-three billion, one hundred thirty-one million, six hundred forty-six thousand, six hundred sixteen".