2312213121 has 10 divisors (see below), whose sum is σ = 3454046882. Its totient is φ = 1541475360.

The previous prime is 2312213117. The next prime is 2312213149. The reversal of 2312213121 is 1213122132.

It can be written as a sum of positive squares in only one way, i.e., 1571012496 + 741200625 = 39636^2 + 27225^2 .

It is not a de Polignac number, because 2312213121 - 2² = 2312213117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2312213094 and 2312213103.

It is not an unprimeable number, because it can be changed into a prime (2312213021) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14272840 + ... + 14273001.

Almost surely, 2^2312213121 is an apocalyptic number.

It is an amenable number.

2312213121 is a deficient number, since it is larger than the sum of its proper divisors (1141833761).

2312213121 is an equidigital number, since it uses as much as digits as its factorization.

2312213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28545853 (or 28545844 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2312213121 is about 48085.4772358557. The cubic root of 2312213121 is about 1322.3384324072.

Adding to 2312213121 its reverse (1213122132), we get a palindrome (3525335253).

The spelling of 2312213121 in words is "two billion, three hundred twelve million, two hundred thirteen thousand, one hundred twenty-one".