21775770764 has 48 divisors (see below), whose sum is σ = 44071685280. Its totient is φ = 9304335360.

The previous prime is 21775770733. The next prime is 21775770769. The reversal of 21775770764 is 46707757712.

It is not an unprimeable number, because it can be changed into a prime (21775770769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 602534 + ... + 637650.

It is an arithmetic number, because the mean of its divisors is an integer number (918160110).

Almost surely, 2^21775770764 is an apocalyptic number.

It is an amenable number.

21775770764 is an abundant number, since it is smaller than the sum of its proper divisors (22295914516).

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

21775770764 is a wasteful number, since it uses less digits than its factorization.

21775770764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35978 (or 35976 counting only the distinct ones).

The product of its (nonzero) digits is 4033680, while the sum is 53.

The spelling of 21775770764 in words is "twenty-one billion, seven hundred seventy-five million, seven hundred seventy thousand, seven hundred sixty-four".