201221131321 has 16 divisors (see below), whose sum is σ = 242163734400. Its totient is φ = 163334700288.

The previous prime is 201221131313. The next prime is 201221131337. The reversal of 201221131321 is 123131122102.

It is a cyclic number.

It is not a de Polignac number, because 201221131321 - 2³ = 201221131313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (201221131301) 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, 57051 + ... + 636943.

It is an arithmetic number, because the mean of its divisors is an integer number (15135233400).

Almost surely, 2^201221131321 is an apocalyptic number.

It is an amenable number.

201221131321 is a deficient number, since it is larger than the sum of its proper divisors (40942603079).

201221131321 is a wasteful number, since it uses less digits than its factorization.

201221131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582528.

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

Adding to 201221131321 its reverse (123131122102), we get a palindrome (324352253423).

The spelling of 201221131321 in words is "two hundred one billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".