312220132121 has 4 divisors (see below), whose sum is σ = 312289813044. Its totient is φ = 312150451200.

The previous prime is 312220132087. The next prime is 312220132123. The reversal of 312220132121 is 121231022213.

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 262640875225 + 49579256896 = 512485^2 + 222664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312220132121 is a prime.

It is a super-3 number, since 3×312220132121³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312220132093 and 312220132102.

It is not an unprimeable number, because it can be changed into a prime (312220132123) 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, 34833740 + ... + 34842701.

It is an arithmetic number, because the mean of its divisors is an integer number (78072453261).

Almost surely, 2^312220132121 is an apocalyptic number.

It is an amenable number.

312220132121 is a deficient number, since it is larger than the sum of its proper divisors (69680923).

312220132121 is an equidigital number, since it uses as much as digits as its factorization.

312220132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69680922.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 312220132121 its reverse (121231022213), we get a palindrome (433451154334).

The spelling of 312220132121 in words is "three hundred twelve billion, two hundred twenty million, one hundred thirty-two thousand, one hundred twenty-one".