312233222111221 has 16 divisors (see below), whose sum is σ = 318405658458240. Its totient is φ = 306110149092160.

The previous prime is 312233222111197. The next prime is 312233222111329. The reversal of 312233222111221 is 122111222332213.

It is a cyclic number.

It is not a de Polignac number, because 312233222111221 - 2¹⁷ = 312233221980149 is a prime.

It is a super-2 number, since 2×312233222111221² (a number of 30 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 312233222111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312233222111021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 795349035 + ... + 795741511.

It is an arithmetic number, because the mean of its divisors is an integer number (19900353653640).

Almost surely, 2^{312233222111221} is an apocalyptic number.

It is an amenable number.

312233222111221 is a deficient number, since it is larger than the sum of its proper divisors (6172436347019).

312233222111221 is a wasteful number, since it uses less digits than its factorization.

312233222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455324.

The product of its digits is 3456, while the sum is 28.

Adding to 312233222111221 its reverse (122111222332213), we get a palindrome (434344444443434).

The spelling of 312233222111221 in words is "three hundred twelve trillion, two hundred thirty-three billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".