312033111221 has 16 divisors (see below), whose sum is σ = 339494133888. Its totient is φ = 285081249600.

The previous prime is 312033111199. The next prime is 312033111227. The reversal of 312033111221 is 122111330213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 312033111221 - 2¹⁸ = 312032849077 is a prime.

It is a super-2 number, since 2×312033111221² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 312033111193 and 312033111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312033111227) 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, 182240 + ... + 810726.

It is an arithmetic number, because the mean of its divisors is an integer number (21218383368).

Almost surely, 2^312033111221 is an apocalyptic number.

It is an amenable number.

312033111221 is a deficient number, since it is larger than the sum of its proper divisors (27461022667).

312033111221 is a wasteful number, since it uses less digits than its factorization.

312033111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628892.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 312033111221 its reverse (122111330213), we get a palindrome (434144441434).

The spelling of 312033111221 in words is "three hundred twelve billion, thirty-three million, one hundred eleven thousand, two hundred twenty-one".