201221013 has 16 divisors (see below), whose sum is σ = 306821120. Its totient is φ = 114908976.

The previous prime is 201221011. The next prime is 201221017. The reversal of 201221013 is 310122102.

It is not a de Polignac number, because 201221013 - 2¹ = 201221011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201221013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58968 + ... + 62286.

It is an arithmetic number, because the mean of its divisors is an integer number (19176320).

Almost surely, 2^201221013 is an apocalyptic number.

It is an amenable number.

201221013 is a deficient number, since it is larger than the sum of its proper divisors (105600107).

201221013 is a wasteful number, since it uses less digits than its factorization.

201221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6216.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 201221013 is about 14185.2392648133. The cubic root of 201221013 is about 585.9912218591.

Adding to 201221013 its reverse (310122102), we get a palindrome (511343115).

The spelling of 201221013 in words is "two hundred one million, two hundred twenty-one thousand, thirteen".