320022221 has 4 divisors (see below), whose sum is σ = 331057500. Its totient is φ = 308986944.

The previous prime is 320022203. The next prime is 320022247. The reversal of 320022221 is 122220023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122220023 = 397 ⋅307859.

It can be written as a sum of positive squares in 2 ways, for example, as 160909225 + 159112996 = 12685^2 + 12614^2 .

It is a cyclic number.

It is not a de Polignac number, because 320022221 - 2²² = 315827917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320022196 and 320022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320022271) 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, 5517596 + ... + 5517653.

It is an arithmetic number, because the mean of its divisors is an integer number (82764375).

Almost surely, 2^320022221 is an apocalyptic number.

It is an amenable number.

320022221 is a deficient number, since it is larger than the sum of its proper divisors (11035279).

320022221 is a wasteful number, since it uses less digits than its factorization.

320022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11035278.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 320022221 is about 17889.1649050480. The cubic root of 320022221 is about 684.0062105440.

Adding to 320022221 its reverse (122220023), we get a palindrome (442242244).

The spelling of 320022221 in words is "three hundred twenty million, twenty-two thousand, two hundred twenty-one".