312213311021 has 4 divisors (see below), whose sum is σ = 312220891452. Its totient is φ = 312205730592.

The previous prime is 312213310991. The next prime is 312213311041. The reversal of 312213311021 is 120113312213.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 278140212100 + 34073098921 = 527390^2 + 184589^2 .

It is a cyclic number.

It is not a de Polignac number, because 312213311021 - 2¹⁸ = 312213048877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312213310984 and 312213311002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312213311041) 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, 3728096 + ... + 3810921.

It is an arithmetic number, because the mean of its divisors is an integer number (78055222863).

Almost surely, 2^312213311021 is an apocalyptic number.

It is an amenable number.

312213311021 is a deficient number, since it is larger than the sum of its proper divisors (7580431).

312213311021 is an equidigital number, since it uses as much as digits as its factorization.

312213311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7580430.

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

Adding to 312213311021 its reverse (120113312213), we get a palindrome (432326623234).

The spelling of 312213311021 in words is "three hundred twelve billion, two hundred thirteen million, three hundred eleven thousand, twenty-one".