231220101121 has 4 divisors (see below), whose sum is σ = 235010594644. Its totient is φ = 227429607600.

The previous prime is 231220101107. The next prime is 231220101127. The reversal of 231220101121 is 121101022132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89693661121 + 141526440000 = 299489^2 + 376200^2 .

It is a cyclic number.

It is not a de Polignac number, because 231220101121 - 2¹¹ = 231220099073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231220101095 and 231220101104.

It is not an unprimeable number, because it can be changed into a prime (231220101127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1895246670 + ... + 1895246791.

It is an arithmetic number, because the mean of its divisors is an integer number (58752648661).

Almost surely, 2^231220101121 is an apocalyptic number.

It is an amenable number.

231220101121 is a deficient number, since it is larger than the sum of its proper divisors (3790493523).

231220101121 is an equidigital number, since it uses as much as digits as its factorization.

231220101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790493522.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 231220101121 its reverse (121101022132), we get a palindrome (352321123253).

The spelling of 231220101121 in words is "two hundred thirty-one billion, two hundred twenty million, one hundred one thousand, one hundred twenty-one".