102102011990 has 96 divisors (see below), whose sum is σ = 207590065920. Its totient is φ = 35857080000.

The previous prime is 102102011989. The next prime is 102102012007. The reversal of 102102011990 is 99110201201.

It is a super-2 number, since 2×102102011990² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97146965 + ... + 97148015.

It is an arithmetic number, because the mean of its divisors is an integer number (2162396520).

Almost surely, 2^102102011990 is an apocalyptic number.

102102011990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102102011990 is an abundant number, since it is smaller than the sum of its proper divisors (105488053930).

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

102102011990 is a wasteful number, since it uses less digits than its factorization.

102102011990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050 (or 2019 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 102102011990 in words is "one hundred two billion, one hundred two million, eleven thousand, nine hundred ninety".