90221 has 4 divisors (see below), whose sum is σ = 91392. Its totient is φ = 89052.

The previous prime is 90217. The next prime is 90227. The reversal of 90221 is 12209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12209 = 29 ⋅421.

It is a cyclic number.

It is not a de Polignac number, because 90221 - 2² = 90217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90196 and 90205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461 + ... + 626.

It is an arithmetic number, because the mean of its divisors is an integer number (22848).

2⁹⁰²²¹ is an apocalyptic number.

It is an amenable number.

90221 is a deficient number, since it is larger than the sum of its proper divisors (1171).

90221 is a wasteful number, since it uses less digits than its factorization.

90221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 90221 is about 300.3681074948. The cubic root of 90221 is about 44.8506986100.

The spelling of 90221 in words is "ninety thousand, two hundred twenty-one".