312021232221 has 8 divisors (see below), whose sum is σ = 416031490080. Its totient is φ = 208012564592.

The previous prime is 312021232207. The next prime is 312021232241. The reversal of 312021232221 is 122232120213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 312021232221 - 2¹¹ = 312021230173 is a prime.

It is a super-2 number, since 2×312021232221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312021232241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180235 + ... + 810263.

It is an arithmetic number, because the mean of its divisors is an integer number (52003936260).

Almost surely, 2^312021232221 is an apocalyptic number.

It is an amenable number.

312021232221 is a deficient number, since it is larger than the sum of its proper divisors (104010257859).

312021232221 is a wasteful number, since it uses less digits than its factorization.

312021232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795115.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 312021232221 its reverse (122232120213), we get a palindrome (434253352434).

The spelling of 312021232221 in words is "three hundred twelve billion, twenty-one million, two hundred thirty-two thousand, two hundred twenty-one".