2115231121 has 4 divisors (see below), whose sum is σ = 2115323172. Its totient is φ = 2115139072.

The previous prime is 2115231119. The next prime is 2115231127. The reversal of 2115231121 is 1211325112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 713477521 + 1401753600 = 26711^2 + 37440^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115231121 - 2¹ = 2115231119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115231127) 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, 20385 + ... + 68161.

It is an arithmetic number, because the mean of its divisors is an integer number (528830793).

Almost surely, 2^2115231121 is an apocalyptic number.

It is an amenable number.

2115231121 is a deficient number, since it is larger than the sum of its proper divisors (92051).

2115231121 is an equidigital number, since it uses as much as digits as its factorization.

2115231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92050.

The product of its digits is 120, while the sum is 19.

The square root of 2115231121 is about 45991.6418602337. The cubic root of 2115231121 is about 1283.6676872259.

Adding to 2115231121 its reverse (1211325112), we get a palindrome (3326556233).

The spelling of 2115231121 in words is "two billion, one hundred fifteen million, two hundred thirty-one thousand, one hundred twenty-one".