102210021990 has 64 divisors (see below), whose sum is σ = 272600510400. Its totient is φ = 27251960832.

The previous prime is 102210021989. The next prime is 102210022001. The reversal of 102210021990 is 99120012201.

It is a super-3 number, since 3×102210021990³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2089654 + ... + 2138006.

It is an arithmetic number, because the mean of its divisors is an integer number (4259382975).

Almost surely, 2^102210021990 is an apocalyptic number.

102210021990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102210021990 is an abundant number, since it is smaller than the sum of its proper divisors (170390488410).

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

102210021990 is a wasteful number, since it uses less digits than its factorization.

102210021990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56198 (or 56192 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 102210021990 in words is "one hundred two billion, two hundred ten million, twenty-one thousand, nine hundred ninety".