312012201221 has 4 divisors (see below), whose sum is σ = 356585372832. Its totient is φ = 267439029612.

The previous prime is 312012201211. The next prime is 312012201247. The reversal of 312012201221 is 122102210213.

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: 122102210213 = 139 ⋅878433167.

It is a cyclic number.

It is not a de Polignac number, because 312012201221 - 2⁶ = 312012201157 is a prime.

It is a super-2 number, since 2×312012201221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312012201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312012201211) 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, 22286585795 + ... + 22286585808.

It is an arithmetic number, because the mean of its divisors is an integer number (89146343208).

Almost surely, 2^312012201221 is an apocalyptic number.

It is an amenable number.

312012201221 is a deficient number, since it is larger than the sum of its proper divisors (44573171611).

312012201221 is an equidigital number, since it uses as much as digits as its factorization.

312012201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44573171610.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 312012201221 its reverse (122102210213), we get a palindrome (434114411434).

The spelling of 312012201221 in words is "three hundred twelve billion, twelve million, two hundred one thousand, two hundred twenty-one".