21210010188 has 24 divisors (see below), whose sum is σ = 51641764608. Its totient is φ = 6762611856.

The previous prime is 21210010177. The next prime is 21210010189. The reversal of 21210010188 is 88101001212.

It is not an unprimeable number, because it can be changed into a prime (21210010189) 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, 38423656 + ... + 38424207.

It is an arithmetic number, because the mean of its divisors is an integer number (2151740192).

Almost surely, 2^21210010188 is an apocalyptic number.

It is an amenable number.

21210010188 is an abundant number, since it is smaller than the sum of its proper divisors (30431754420).

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

21210010188 is a wasteful number, since it uses less digits than its factorization.

21210010188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76847893 (or 76847891 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 24.

The spelling of 21210010188 in words is "twenty-one billion, two hundred ten million, ten thousand, one hundred eighty-eight".