321221217 has 4 divisors (see below), whose sum is σ = 428294960. Its totient is φ = 214147476.

The previous prime is 321221213. The next prime is 321221221. The reversal of 321221217 is 712122123.

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 an interprime number because it is at equal distance from previous prime (321221213) and next prime (321221221).

It is not a de Polignac number, because 321221217 - 2² = 321221213 is a prime.

It is a super-2 number, since 2×321221217² = 206366140501922178, 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 = 321221193 and 321221202.

It is not an unprimeable number, because it can be changed into a prime (321221213) 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, 53536867 + ... + 53536872.

It is an arithmetic number, because the mean of its divisors is an integer number (107073740).

Almost surely, 2^321221217 is an apocalyptic number.

It is an amenable number.

321221217 is a deficient number, since it is larger than the sum of its proper divisors (107073743).

321221217 is a wasteful number, since it uses less digits than its factorization.

321221217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107073742.

The product of its digits is 336, while the sum is 21.

The square root of 321221217 is about 17922.6453683601. The cubic root of 321221217 is about 684.8593790233.

The spelling of 321221217 in words is "three hundred twenty-one million, two hundred twenty-one thousand, two hundred seventeen".