311212233121 has 4 divisors (see below), whose sum is σ = 312093854532. Its totient is φ = 310330611712.

The previous prime is 311212233113. The next prime is 311212233127. The reversal of 311212233121 is 121332212113.

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 86104686096 + 225107547025 = 293436^2 + 474455^2 .

It is a cyclic number.

It is not a de Polignac number, because 311212233121 - 2³ = 311212233113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311212233092 and 311212233101.

It is not an unprimeable number, because it can be changed into a prime (311212233127) 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, 440810176 + ... + 440810881.

It is an arithmetic number, because the mean of its divisors is an integer number (78023463633).

Almost surely, 2^311212233121 is an apocalyptic number.

It is an amenable number.

311212233121 is a deficient number, since it is larger than the sum of its proper divisors (881621411).

311212233121 is an equidigital number, since it uses as much as digits as its factorization.

311212233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881621410.

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

Adding to 311212233121 its reverse (121332212113), we get a palindrome (432544445234).

The spelling of 311212233121 in words is "three hundred eleven billion, two hundred twelve million, two hundred thirty-three thousand, one hundred twenty-one".