312003221 has 4 divisors (see below), whose sum is σ = 313620012. Its totient is φ = 310386432.

The previous prime is 312003187. The next prime is 312003229. The reversal of 312003221 is 122300213.

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 225420196 + 86583025 = 15014^2 + 9305^2 .

It is a cyclic number.

It is not a de Polignac number, because 312003221 - 2⁶ = 312003157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312003196 and 312003205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312003229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808106 + ... + 808491.

It is an arithmetic number, because the mean of its divisors is an integer number (78405003).

Almost surely, 2^312003221 is an apocalyptic number.

It is an amenable number.

312003221 is a deficient number, since it is larger than the sum of its proper divisors (1616791).

312003221 is a wasteful number, since it uses less digits than its factorization.

312003221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616790.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 312003221 is about 17663.6129090285. The cubic root of 312003221 is about 678.2446225888.

Adding to 312003221 its reverse (122300213), we get a palindrome (434303434).

The spelling of 312003221 in words is "three hundred twelve million, three thousand, two hundred twenty-one".