201221302331 has 16 divisors (see below), whose sum is σ = 232435027968. Its totient is φ = 170627925600.

The previous prime is 201221302319. The next prime is 201221302339. The reversal of 201221302331 is 133203122102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221302331 is a prime.

It is a super-2 number, since 2×201221302331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221302339) 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, 573701 + ... + 855321.

It is an arithmetic number, because the mean of its divisors is an integer number (14527189248).

Almost surely, 2^201221302331 is an apocalyptic number.

201221302331 is a deficient number, since it is larger than the sum of its proper divisors (31213725637).

201221302331 is a wasteful number, since it uses less digits than its factorization.

201221302331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282722.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 201221302331 its reverse (133203122102), we get a palindrome (334424424433).

The spelling of 201221302331 in words is "two hundred one billion, two hundred twenty-one million, three hundred two thousand, three hundred thirty-one".