201031220121 has 16 divisors (see below), whose sum is σ = 268470547200. Its totient is φ = 133806434048.

The previous prime is 201031220101. The next prime is 201031220123. The reversal of 201031220121 is 121022130102.

It is a cyclic number.

It is not a de Polignac number, because 201031220121 - 2¹⁰ = 201031219097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201031220121.

It is not an unprimeable number, because it can be changed into a prime (201031220123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18175825 + ... + 18186881.

It is an arithmetic number, because the mean of its divisors is an integer number (16779409200).

Almost surely, 2^201031220121 is an apocalyptic number.

It is an amenable number.

201031220121 is a deficient number, since it is larger than the sum of its proper divisors (67439327079).

201031220121 is a wasteful number, since it uses less digits than its factorization.

201031220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20208.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 201031220121 its reverse (121022130102), we get a palindrome (322053350223).

The spelling of 201031220121 in words is "two hundred one billion, thirty-one million, two hundred twenty thousand, one hundred twenty-one".