201021220231 has 16 divisors (see below), whose sum is σ = 223360008480. Its totient is φ = 179729786880.

The previous prime is 201021220217. The next prime is 201021220273. The reversal of 201021220231 is 132022120102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 201021220231 - 2¹⁹ = 201020695943 is a prime.

It is a super-2 number, since 2×201021220231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021220291) 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, 1282570 + ... + 1430743.

It is an arithmetic number, because the mean of its divisors is an integer number (13960000530).

Almost surely, 2^201021220231 is an apocalyptic number.

201021220231 is a deficient number, since it is larger than the sum of its proper divisors (22338788249).

201021220231 is a wasteful number, since it uses less digits than its factorization.

201021220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713506.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 201021220231 its reverse (132022120102), we get a palindrome (333043340333).

The spelling of 201021220231 in words is "two hundred one billion, twenty-one million, two hundred twenty thousand, two hundred thirty-one".