21877765446 has 16 divisors (see below), whose sum is σ = 44938113264. Its totient is φ = 7095491424.

The previous prime is 21877765423. The next prime is 21877765451. The reversal of 21877765446 is 64456777812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49274025 + ... + 49274468.

It is an arithmetic number, because the mean of its divisors is an integer number (2808632079).

Almost surely, 2^21877765446 is an apocalyptic number.

21877765446 is an abundant number, since it is smaller than the sum of its proper divisors (23060347818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21877765446 is a wasteful number, since it uses less digits than its factorization.

21877765446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98548535.

The product of its digits is 15805440, while the sum is 57.

The spelling of 21877765446 in words is "twenty-one billion, eight hundred seventy-seven million, seven hundred sixty-five thousand, four hundred forty-six".