902211221 has 4 divisors (see below), whose sum is σ = 902313600. Its totient is φ = 902108844.

The previous prime is 902211187. The next prime is 902211283. The reversal of 902211221 is 122112209.

It is a happy number.

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 902211221 - 2¹⁴ = 902194837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 902211193 and 902211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (902511221) 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, 36581 + ... + 56058.

It is an arithmetic number, because the mean of its divisors is an integer number (225578400).

Almost surely, 2^902211221 is an apocalyptic number.

It is an amenable number.

902211221 is a deficient number, since it is larger than the sum of its proper divisors (102379).

902211221 is an equidigital number, since it uses as much as digits as its factorization.

902211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102378.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 902211221 is about 30036.8310745325. The cubic root of 902211221 is about 966.2794454782.

The spelling of 902211221 in words is "nine hundred two million, two hundred eleven thousand, two hundred twenty-one".