21865461708 has 48 divisors (see below), whose sum is σ = 51774195200. Its totient is φ = 7181374464.

The previous prime is 21865461703. The next prime is 21865461719. The reversal of 21865461708 is 80716456812.

It is not an unprimeable number, because it can be changed into a prime (21865461701) 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, 201516 + ... + 290412.

Almost surely, 2^21865461708 is an apocalyptic number.

It is an amenable number.

21865461708 is an abundant number, since it is smaller than the sum of its proper divisors (29908733492).

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

21865461708 is a wasteful number, since it uses less digits than its factorization.

21865461708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89206 (or 89204 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 21865461708 in words is "twenty-one billion, eight hundred sixty-five million, four hundred sixty-one thousand, seven hundred eight".