90102221 has 8 divisors (see below), whose sum is σ = 99640704. Its totient is φ = 80788320.

The previous prime is 90102211. The next prime is 90102251. The reversal of 90102221 is 12220109.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90102221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90102211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55301 + ... + 56906.

It is an arithmetic number, because the mean of its divisors is an integer number (12455088).

Almost surely, 2^90102221 is an apocalyptic number.

It is an amenable number.

90102221 is a deficient number, since it is larger than the sum of its proper divisors (9538483).

90102221 is a wasteful number, since it uses less digits than its factorization.

90102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112291.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 90102221 is about 9492.2189713470. The cubic root of 90102221 is about 448.3100747859.

The spelling of 90102221 in words is "ninety million, one hundred two thousand, two hundred twenty-one".