102221808 has 80 divisors (see below), whose sum is σ = 287231616. Its totient is φ = 31138560.

The previous prime is 102221803. The next prime is 102221831. The reversal of 102221808 is 808122201.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66003 + ... + 67533.

Almost surely, 2^102221808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102221808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143615808).

102221808 is an abundant number, since it is smaller than the sum of its proper divisors (185009808).

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

102221808 is a wasteful number, since it uses less digits than its factorization.

102221808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662 (or 1656 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 102221808 is about 10110.4801072946. The cubic root of 102221808 is about 467.5713073382.

The spelling of 102221808 in words is "one hundred two million, two hundred twenty-one thousand, eight hundred eight".