312221023 has 4 divisors (see below), whose sum is σ = 312748128. Its totient is φ = 311693920.

The previous prime is 312221011. The next prime is 312221069. The reversal of 312221023 is 320122213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312221023 - 2¹⁷ = 312089951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312220988 and 312221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312221003) 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, 262663 + ... + 263848.

It is an arithmetic number, because the mean of its divisors is an integer number (78187032).

Almost surely, 2^312221023 is an apocalyptic number.

312221023 is a deficient number, since it is larger than the sum of its proper divisors (527105).

312221023 is an equidigital number, since it uses as much as digits as its factorization.

312221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527104.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 312221023 is about 17669.7771066870. Note that the first 3 decimals coincide. The cubic root of 312221023 is about 678.4024080055.

Adding to 312221023 its reverse (320122213), we get a palindrome (632343236).

The spelling of 312221023 in words is "three hundred twelve million, two hundred twenty-one thousand, twenty-three".