21769309472 has 24 divisors (see below), whose sum is σ = 45379407276. Its totient is φ = 10244380672.

The previous prime is 21769309433. The next prime is 21769309477. The reversal of 21769309472 is 27490396712.

It can be written as a sum of positive squares in 2 ways, for example, as 21702003856 + 67305616 = 147316^2 + 8204^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21769309472.

It is not an unprimeable number, because it can be changed into a prime (21769309477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20008013 + ... + 20009100.

Almost surely, 2^21769309472 is an apocalyptic number.

It is an amenable number.

21769309472 is an abundant number, since it is smaller than the sum of its proper divisors (23610097804).

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

21769309472 is a wasteful number, since it uses less digits than its factorization.

21769309472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40017140 (or 40017132 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 50.

The spelling of 21769309472 in words is "twenty-one billion, seven hundred sixty-nine million, three hundred nine thousand, four hundred seventy-two".