231120121 has 4 divisors (see below), whose sum is σ = 235480932. Its totient is φ = 226759312.

The previous prime is 231120119. The next prime is 231120133. The reversal of 231120121 is 121021132.

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 78943225 + 152176896 = 8885^2 + 12336^2 .

It is a cyclic number.

It is not a de Polignac number, because 231120121 - 2¹ = 231120119 is a prime.

It is a super-3 number, since 3×231120121³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231120101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2180326 + ... + 2180431.

It is an arithmetic number, because the mean of its divisors is an integer number (58870233).

Almost surely, 2^231120121 is an apocalyptic number.

It is an amenable number.

231120121 is a deficient number, since it is larger than the sum of its proper divisors (4360811).

231120121 is an equidigital number, since it uses as much as digits as its factorization.

231120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360810.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 231120121 is about 15202.6353307576. The cubic root of 231120121 is about 613.6855801576.

Adding to 231120121 its reverse (121021132), we get a palindrome (352141253).

The spelling of 231120121 in words is "two hundred thirty-one million, one hundred twenty thousand, one hundred twenty-one".