902201221 has 4 divisors (see below), whose sum is σ = 903708000. Its totient is φ = 900694444.

The previous prime is 902201219. The next prime is 902201231. The reversal of 902201221 is 122102209.

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 902201221 - 2¹ = 902201219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (902201231) 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, 752491 + ... + 753688.

It is an arithmetic number, because the mean of its divisors is an integer number (225927000).

Almost surely, 2^902201221 is an apocalyptic number.

It is an amenable number.

902201221 is a deficient number, since it is larger than the sum of its proper divisors (1506779).

902201221 is a wasteful number, since it uses less digits than its factorization.

902201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506778.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 902201221 is about 30036.6646117707. The cubic root of 902201221 is about 966.2758754235.

The spelling of 902201221 in words is "nine hundred two million, two hundred one thousand, two hundred twenty-one".