21769550260 has 24 divisors (see below), whose sum is σ = 48405236040. Its totient is φ = 8195595264.

The previous prime is 21769550203. The next prime is 21769550261. The reversal of 21769550260 is 6205596712.

It can be written as a sum of positive squares in 4 ways, for example, as 11480693904 + 10288856356 = 107148^2 + 101434^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21769550261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32013705 + ... + 32014384.

It is an arithmetic number, because the mean of its divisors is an integer number (2016884835).

Almost surely, 2^21769550260 is an apocalyptic number.

21769550260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21769550260 is an abundant number, since it is smaller than the sum of its proper divisors (26635685780).

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

21769550260 is a wasteful number, since it uses less digits than its factorization.

21769550260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64028115 (or 64028113 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 21769550260 in words is "twenty-one billion, seven hundred sixty-nine million, five hundred fifty thousand, two hundred sixty".