90033221 has 4 divisors (see below), whose sum is σ = 90742272. Its totient is φ = 89324172.

The previous prime is 90033217. The next prime is 90033263. The reversal of 90033221 is 12233009.

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.

It is a cyclic number.

It is not a de Polignac number, because 90033221 - 2² = 90033217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90033193 and 90033202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90033211) 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, 354335 + ... + 354588.

It is an arithmetic number, because the mean of its divisors is an integer number (22685568).

Almost surely, 2^90033221 is an apocalyptic number.

It is an amenable number.

90033221 is a deficient number, since it is larger than the sum of its proper divisors (709051).

90033221 is a wasteful number, since it uses less digits than its factorization.

90033221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709050.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 90033221 is about 9488.5837193967. The cubic root of 90033221 is about 448.1956074087.

The spelling of 90033221 in words is "ninety million, thirty-three thousand, two hundred twenty-one".