320121221 has 8 divisors (see below), whose sum is σ = 377654784. Its totient is φ = 265538160.

The previous prime is 320121211. The next prime is 320121247. The reversal of 320121221 is 122121023.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320121221 - 2¹⁸ = 319859077 is a prime.

It is a super-2 number, since 2×320121221² = 204955192269061682, 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 = 320121196 and 320121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320121211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737390 + ... + 737823.

It is an arithmetic number, because the mean of its divisors is an integer number (47206848).

Almost surely, 2^320121221 is an apocalyptic number.

320121221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

320121221 is a deficient number, since it is larger than the sum of its proper divisors (57533563).

320121221 is a wasteful number, since it uses less digits than its factorization.

320121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475251.

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

The square root of 320121221 is about 17891.9317291342. The cubic root of 320121221 is about 684.0767365146.

Adding to 320121221 its reverse (122121023), we get a palindrome (442242244).

It can be divided in two parts, 32012 and 1221, that added together give a palindrome (33233).

The spelling of 320121221 in words is "three hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".