312223311021 has 4 divisors (see below), whose sum is σ = 416297748032. Its totient is φ = 208148874012.

The previous prime is 312223310981. The next prime is 312223311053. The reversal of 312223311021 is 120113322213.

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.

It is not a de Polignac number, because 312223311021 - 2⁶ = 312223310957 is a prime.

It is a super-2 number, since 2×312223311021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312223311121) 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, 52037218501 + ... + 52037218506.

It is an arithmetic number, because the mean of its divisors is an integer number (104074437008).

Almost surely, 2^312223311021 is an apocalyptic number.

It is an amenable number.

312223311021 is a deficient number, since it is larger than the sum of its proper divisors (104074437011).

312223311021 is a wasteful number, since it uses less digits than its factorization.

312223311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104074437010.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 312223311021 its reverse (120113322213), we get a palindrome (432336633234).

The spelling of 312223311021 in words is "three hundred twelve billion, two hundred twenty-three million, three hundred eleven thousand, twenty-one".