321201221 has 4 divisors (see below), whose sum is σ = 350401344. Its totient is φ = 292001100.

The previous prime is 321201217. The next prime is 321201229. The reversal of 321201221 is 122102123.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 321201221 - 2² = 321201217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321201196 and 321201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321201229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14600045 + ... + 14600066.

It is an arithmetic number, because the mean of its divisors is an integer number (87600336).

Almost surely, 2^321201221 is an apocalyptic number.

It is an amenable number.

321201221 is a deficient number, since it is larger than the sum of its proper divisors (29200123).

321201221 is a wasteful number, since it uses less digits than its factorization.

321201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29200122.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 321201221 is about 17922.0875179205. The cubic root of 321201221 is about 684.8451679111.

Adding to 321201221 its reverse (122102123), we get a palindrome (443303344).

The spelling of 321201221 in words is "three hundred twenty-one million, two hundred one thousand, two hundred twenty-one".