201221930 has 96 divisors (see below), whose sum is σ = 468840960. Its totient is φ = 61568640.

The previous prime is 201221929. The next prime is 201221939. The reversal of 201221930 is 39122102.

It is a super-2 number, since 2×201221930² = 80980530225849800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201221939) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196961 + ... + 197979.

It is an arithmetic number, because the mean of its divisors is an integer number (4883760).

Almost surely, 2^201221930 is an apocalyptic number.

201221930 is an abundant number, since it is smaller than the sum of its proper divisors (267619030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201221930 is a wasteful number, since it uses less digits than its factorization.

201221930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 201221930 is about 14185.2715871075. The cubic root of 201221930 is about 585.9921120132.

The spelling of 201221930 in words is "two hundred one million, two hundred twenty-one thousand, nine hundred thirty".