312121211322 has 16 divisors (see below), whose sum is σ = 627729812640. Its totient is φ = 103459172112.

The previous prime is 312121211321. The next prime is 312121211341. The reversal of 312121211322 is 223112121213.

It is a super-2 number, since 2×312121211322² (a number of 24 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (312121211321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145306753 + ... + 145308900.

It is an arithmetic number, because the mean of its divisors is an integer number (39233113290).

Almost surely, 2^312121211322 is an apocalyptic number.

312121211322 is an abundant number, since it is smaller than the sum of its proper divisors (315608601318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312121211322 is a wasteful number, since it uses less digits than its factorization.

312121211322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290615837.

The product of its digits is 288, while the sum is 21.

Adding to 312121211322 its reverse (223112121213), we get a palindrome (535233332535).

The spelling of 312121211322 in words is "three hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, three hundred twenty-two".