201331015221 has 24 divisors (see below), whose sum is σ = 313092527520. Its totient is φ = 114742710432.

The previous prime is 201331015153. The next prime is 201331015241. The reversal of 201331015221 is 122510133102.

It is not a de Polignac number, because 201331015221 - 2²⁶ = 201263906357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201331015241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1751146 + ... + 1862571.

It is an arithmetic number, because the mean of its divisors is an integer number (13045521980).

Almost surely, 2^201331015221 is an apocalyptic number.

201331015221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201331015221 is a deficient number, since it is larger than the sum of its proper divisors (111761512299).

201331015221 is a wasteful number, since it uses less digits than its factorization.

201331015221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614113 (or 3614106 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 201331015221 its reverse (122510133102), we get a palindrome (323841148323).

The spelling of 201331015221 in words is "two hundred one billion, three hundred thirty-one million, fifteen thousand, two hundred twenty-one".