21861167700 has 36 divisors (see below), whose sum is σ = 63251646080. Its totient is φ = 5829644640.

The previous prime is 21861167683. The next prime is 21861167743. The reversal of 21861167700 is 776116812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36434980 + ... + 36435579.

Almost surely, 2^21861167700 is an apocalyptic number.

21861167700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21861167700 is an abundant number, since it is smaller than the sum of its proper divisors (41390478380).

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

21861167700 is a wasteful number, since it uses less digits than its factorization.

21861167700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72870576 (or 72870569 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The spelling of 21861167700 in words is "twenty-one billion, eight hundred sixty-one million, one hundred sixty-seven thousand, seven hundred".