312432221 has 4 divisors (see below), whose sum is σ = 312551100. Its totient is φ = 312313344.

The previous prime is 312432217. The next prime is 312432227. The reversal of 312432221 is 122234213.

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 25502500 + 286929721 = 5050^2 + 16939^2 .

It is a cyclic number.

It is not a de Polignac number, because 312432221 - 2² = 312432217 is a prime.

It is a super-2 number, since 2×312432221² = 195227785437985682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312432193 and 312432202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312432227) 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 3 ways as a sum of consecutive naturals, for example, 55406 + ... + 60783.

It is an arithmetic number, because the mean of its divisors is an integer number (78137775).

Almost surely, 2^312432221 is an apocalyptic number.

It is an amenable number.

312432221 is a deficient number, since it is larger than the sum of its proper divisors (118879).

312432221 is a wasteful number, since it uses less digits than its factorization.

312432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118878.

The product of its digits is 576, while the sum is 20.

The square root of 312432221 is about 17675.7523460813. The cubic root of 312432221 is about 678.5553391315. Note that the first 3 decimals are identical.

Adding to 312432221 its reverse (122234213), we get a palindrome (434666434).

The spelling of 312432221 in words is "three hundred twelve million, four hundred thirty-two thousand, two hundred twenty-one".