900221 has 4 divisors (see below), whose sum is σ = 1028832. Its totient is φ = 771612.

The previous prime is 900217. The next prime is 900233. The reversal of 900221 is 122009.

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: 122009 = 17 ⋅7177.

It is a cyclic number.

It is not a de Polignac number, because 900221 - 2² = 900217 is a prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 900196 and 900205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900241) 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, 64295 + ... + 64308.

It is an arithmetic number, because the mean of its divisors is an integer number (257208).

2⁹⁰⁰²²¹ is an apocalyptic number.

It is an amenable number.

900221 is a deficient number, since it is larger than the sum of its proper divisors (128611).

900221 is a wasteful number, since it uses less digits than its factorization.

900221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128610.

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

The square root of 900221 is about 948.7997681281. The cubic root of 900221 is about 96.5568405232.

The spelling of 900221 in words is "nine hundred thousand, two hundred twenty-one".