312220221 has 8 divisors (see below), whose sum is σ = 416433984. Its totient is φ = 208076640.

The previous prime is 312220219. The next prime is 312220231. The reversal of 312220221 is 122022213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 312220221 - 2¹ = 312220219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312220211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6096 + ... + 25721.

It is an arithmetic number, because the mean of its divisors is an integer number (52054248).

Almost surely, 2^312220221 is an apocalyptic number.

It is an amenable number.

312220221 is a deficient number, since it is larger than the sum of its proper divisors (104213763).

312220221 is a wasteful number, since it uses less digits than its factorization.

312220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35091.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 312220221 is about 17669.7544125548. The cubic root of 312220221 is about 678.4018271358.

Adding to 312220221 its reverse (122022213), we get a palindrome (434242434).

The spelling of 312220221 in words is "three hundred twelve million, two hundred twenty thousand, two hundred twenty-one".