312231132121 has 4 divisors (see below), whose sum is σ = 312237281232. Its totient is φ = 312224983012.

The previous prime is 312231132107. The next prime is 312231132137. The reversal of 312231132121 is 121231132213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312231132121 - 2⁹ = 312231131609 is a prime.

It is a super-2 number, since 2×312231132121² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312231132092 and 312231132101.

It is not an unprimeable number, because it can be changed into a prime (312231132151) 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, 2997751 + ... + 3100156.

It is an arithmetic number, because the mean of its divisors is an integer number (78059320308).

Almost surely, 2^312231132121 is an apocalyptic number.

It is an amenable number.

312231132121 is a deficient number, since it is larger than the sum of its proper divisors (6149111).

312231132121 is an equidigital number, since it uses as much as digits as its factorization.

312231132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6149110.

The product of its digits is 432, while the sum is 22.

Adding to 312231132121 its reverse (121231132213), we get a palindrome (433462264334).

The spelling of 312231132121 in words is "three hundred twelve billion, two hundred thirty-one million, one hundred thirty-two thousand, one hundred twenty-one".