312201230221 has 4 divisors (see below), whose sum is σ = 312646596444. Its totient is φ = 311755864000.

The previous prime is 312201230207. The next prime is 312201230239. The reversal of 312201230221 is 122032102213.

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 234144693225 + 78056536996 = 483885^2 + 279386^2 .

It is a cyclic number.

It is not a de Polignac number, because 312201230221 - 2¹¹ = 312201228173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312201239221) 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, 222682060 + ... + 222683461.

It is an arithmetic number, because the mean of its divisors is an integer number (78161649111).

Almost surely, 2^312201230221 is an apocalyptic number.

It is an amenable number.

312201230221 is a deficient number, since it is larger than the sum of its proper divisors (445366223).

312201230221 is an equidigital number, since it uses as much as digits as its factorization.

312201230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445366222.

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

Adding to 312201230221 its reverse (122032102213), we get a palindrome (434233332434).

The spelling of 312201230221 in words is "three hundred twelve billion, two hundred one million, two hundred thirty thousand, two hundred twenty-one".