201221958 has 16 divisors (see below), whose sum is σ = 459936000. Its totient is φ = 57491976.

The previous prime is 201221939. The next prime is 201221959. The reversal of 201221958 is 859122102.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2395458 + ... + 2395541.

It is an arithmetic number, because the mean of its divisors is an integer number (28746000).

Almost surely, 2^201221958 is an apocalyptic number.

201221958 is an abundant number, since it is smaller than the sum of its proper divisors (258714042).

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

201221958 is a wasteful number, since it uses less digits than its factorization.

201221958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791011.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 201221958 is about 14185.2725740466. The cubic root of 201221958 is about 585.9921391934.

The spelling of 201221958 in words is "two hundred one million, two hundred twenty-one thousand, nine hundred fifty-eight".