21550743161764 has 12 divisors (see below), whose sum is σ = 37812269988864. Its totient is φ = 10747237450664.

The previous prime is 21550743161669. The next prime is 21550743161789. The reversal of 21550743161764 is 46716134705512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7033530832 + ... + 7033533895.

It is an arithmetic number, because the mean of its divisors is an integer number (3151022499072).

Almost surely, 2^{21550743161764} is an apocalyptic number.

It is an amenable number.

21550743161764 is a deficient number, since it is larger than the sum of its proper divisors (16261526827100).

21550743161764 is a wasteful number, since it uses less digits than its factorization.

21550743161764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14067065114 (or 14067065112 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 52.

The spelling of 21550743161764 in words is "twenty-one trillion, five hundred fifty billion, seven hundred forty-three million, one hundred sixty-one thousand, seven hundred sixty-four".