312231012121 has 4 divisors (see below), whose sum is σ = 356835442432. Its totient is φ = 267626581812.

The previous prime is 312231012113. The next prime is 312231012143. The reversal of 312231012121 is 121210132213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121210132213 = 2777 ⋅43647869.

It is a cyclic number.

It is not a de Polignac number, because 312231012121 - 2³ = 312231012113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312231012101) 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, 22302215145 + ... + 22302215158.

It is an arithmetic number, because the mean of its divisors is an integer number (89208860608).

Almost surely, 2^312231012121 is an apocalyptic number.

It is an amenable number.

312231012121 is a deficient number, since it is larger than the sum of its proper divisors (44604430311).

312231012121 is an equidigital number, since it uses as much as digits as its factorization.

312231012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44604430310.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 312231012121 its reverse (121210132213), we get a palindrome (433441144334).

The spelling of 312231012121 in words is "three hundred twelve billion, two hundred thirty-one million, twelve thousand, one hundred twenty-one".