21964577860 has 12 divisors (see below), whose sum is σ = 46125613548. Its totient is φ = 8785831136.

The previous prime is 21964577827. The next prime is 21964577909. The reversal of 21964577860 is 6877546912.

It can be written as a sum of positive squares in 2 ways, for example, as 3136896064 + 18827681796 = 56008^2 + 137214^2 .

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, 549114427 + ... + 549114466.

It is an arithmetic number, because the mean of its divisors is an integer number (3843801129).

Almost surely, 2^21964577860 is an apocalyptic number.

21964577860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21964577860 is an abundant number, since it is smaller than the sum of its proper divisors (24161035688).

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

21964577860 is a wasteful number, since it uses less digits than its factorization.

21964577860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098228902 (or 1098228900 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 21964577860 in words is "twenty-one billion, nine hundred sixty-four million, five hundred seventy-seven thousand, eight hundred sixty".