21870166700 has 36 divisors (see below), whose sum is σ = 48615789432. Its totient is φ = 8534697600.

The previous prime is 21870166693. The next prime is 21870166711. The reversal of 21870166700 is 766107812.

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, 2662994 + ... + 2671193.

Almost surely, 2^21870166700 is an apocalyptic number.

21870166700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21870166700 is an abundant number, since it is smaller than the sum of its proper divisors (26745622732).

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

21870166700 is a wasteful number, since it uses less digits than its factorization.

21870166700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5334242 (or 5334235 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 21870166700 in words is "twenty-one billion, eight hundred seventy million, one hundred sixty-six thousand, seven hundred".