102021808 has 20 divisors (see below), whose sum is σ = 225905680. Its totient is φ = 43723584.

The previous prime is 102021779. The next prime is 102021823. The reversal of 102021808 is 808120201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455343 + ... + 455566.

It is an arithmetic number, because the mean of its divisors is an integer number (11295284).

Almost surely, 2^102021808 is an apocalyptic number.

It is an amenable number.

102021808 is an abundant number, since it is smaller than the sum of its proper divisors (123883872).

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

102021808 is an equidigital number, since it uses as much as digits as its factorization.

102021808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910924 (or 910918 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 102021808 is about 10100.5845375404. The cubic root of 102021808 is about 467.2661692028.

The spelling of 102021808 in words is "one hundred two million, twenty-one thousand, eight hundred eight".