900211221 has 96 divisors (see below), whose sum is σ = 1674003968. Its totient is φ = 453496320.

The previous prime is 900211189. The next prime is 900211229. The reversal of 900211221 is 122112009.

It is not a de Polignac number, because 900211221 - 2⁵ = 900211189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 900211194 and 900211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900211229) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1848240 + ... + 1848726.

Almost surely, 2^900211221 is an apocalyptic number.

900211221 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

900211221 is a deficient number, since it is larger than the sum of its proper divisors (773792747).

900211221 is a wasteful number, since it uses less digits than its factorization.

900211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 900211221 is about 30003.5201434765. The cubic root of 900211221 is about 965.5649089322.

The spelling of 900211221 in words is "nine hundred million, two hundred eleven thousand, two hundred twenty-one".