321221231 has 4 divisors (see below), whose sum is σ = 321282000. Its totient is φ = 321160464.

The previous prime is 321221221. The next prime is 321221233. The reversal of 321221231 is 132122123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321221231 - 2⁶ = 321221167 is a prime.

It is a super-2 number, since 2×321221231² = 206366158490310722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321221233) 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, 21611 + ... + 33308.

It is an arithmetic number, because the mean of its divisors is an integer number (80320500).

Almost surely, 2^321221231 is an apocalyptic number.

321221231 is a deficient number, since it is larger than the sum of its proper divisors (60769).

321221231 is an equidigital number, since it uses as much as digits as its factorization.

321221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60768.

The product of its digits is 144, while the sum is 17.

The square root of 321221231 is about 17922.6457589274. The cubic root of 321221231 is about 684.8593889729.

Adding to 321221231 its reverse (132122123), we get a palindrome (453343354).

The spelling of 321221231 in words is "three hundred twenty-one million, two hundred twenty-one thousand, two hundred thirty-one".