90013221 has 8 divisors (see below), whose sum is σ = 133352960. Its totient is φ = 60008796.

The previous prime is 90013213. The next prime is 90013223. The reversal of 90013221 is 12231009.

It is a happy number.

It is not a de Polignac number, because 90013221 - 2³ = 90013213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90013194 and 90013203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90013223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1666885 + ... + 1666938.

It is an arithmetic number, because the mean of its divisors is an integer number (16669120).

Almost surely, 2^90013221 is an apocalyptic number.

It is an amenable number.

90013221 is a deficient number, since it is larger than the sum of its proper divisors (43339739).

90013221 is a wasteful number, since it uses less digits than its factorization.

90013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333832 (or 3333826 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 90013221 is about 9487.5297627992. The cubic root of 90013221 is about 448.1624175265.

The spelling of 90013221 in words is "ninety million, thirteen thousand, two hundred twenty-one".