2312157121 has 4 divisors (see below), whose sum is σ = 2374647892. Its totient is φ = 2249666352.

The previous prime is 2312157073. The next prime is 2312157137. The reversal of 2312157121 is 1217512132.

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 1133264896 + 1178892225 = 33664^2 + 34335^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312157121 - 2¹¹ = 2312155073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2312157161) 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, 31245330 + ... + 31245403.

It is an arithmetic number, because the mean of its divisors is an integer number (593661973).

Almost surely, 2^2312157121 is an apocalyptic number.

It is an amenable number.

2312157121 is a deficient number, since it is larger than the sum of its proper divisors (62490771).

2312157121 is an equidigital number, since it uses as much as digits as its factorization.

2312157121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62490770.

The product of its digits is 840, while the sum is 25.

The square root of 2312157121 is about 48084.8949359360. The cubic root of 2312157121 is about 1322.3277569856.

Adding to 2312157121 its reverse (1217512132), we get a palindrome (3529669253).

The spelling of 2312157121 in words is "two billion, three hundred twelve million, one hundred fifty-seven thousand, one hundred twenty-one".