21885000188 has 24 divisors (see below), whose sum is σ = 39546716160. Its totient is φ = 10586162160.

The previous prime is 21885000187. The next prime is 21885000229. The reversal of 21885000188 is 88100058812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21885000187) 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, 390245 + ... + 442787.

It is an arithmetic number, because the mean of its divisors is an integer number (1647779840).

Almost surely, 2^21885000188 is an apocalyptic number.

It is an amenable number.

21885000188 is a deficient number, since it is larger than the sum of its proper divisors (17661715972).

21885000188 is a wasteful number, since it uses less digits than its factorization.

21885000188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55937 (or 55935 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 41.

The spelling of 21885000188 in words is "twenty-one billion, eight hundred eighty-five million, one hundred eighty-eight", and thus it is an aban number.