312220132021 has 12 divisors (see below), whose sum is σ = 375718809420. Its totient is φ = 258389073600.

The previous prime is 312220132009. The next prime is 312220132031. The reversal of 312220132021 is 120231022213.

It can be written as a sum of positive squares in 2 ways, for example, as 148348995921 + 163871136100 = 385161^2 + 404810^2 .

It is not a de Polignac number, because 312220132021 - 2¹⁷ = 312220000949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312220132021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312220132031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109857880 + ... + 109860721.

It is an arithmetic number, because the mean of its divisors is an integer number (31309900785).

Almost surely, 2^312220132021 is an apocalyptic number.

It is an amenable number.

312220132021 is a deficient number, since it is larger than the sum of its proper divisors (63498677399).

312220132021 is a wasteful number, since it uses less digits than its factorization.

312220132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219718644 (or 219718637 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 312220132021 its reverse (120231022213), we get a palindrome (432451154234).

The spelling of 312220132021 in words is "three hundred twelve billion, two hundred twenty million, one hundred thirty-two thousand, twenty-one".