320222921 has 2 divisors, whose sum is σ = 320222922. Its totient is φ = 320222920.

The previous prime is 320222887. The next prime is 320222927. The reversal of 320222921 is 129222023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186704896 + 133518025 = 13664^2 + 11555^2 .

It is a cyclic number.

It is not a de Polignac number, because 320222921 - 2⁶ = 320222857 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (320222927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160111460 + 160111461.

It is an arithmetic number, because the mean of its divisors is an integer number (160111461).

Almost surely, 2^320222921 is an apocalyptic number.

It is an amenable number.

320222921 is a deficient number, since it is larger than the sum of its proper divisors (1).

320222921 is an equidigital number, since it uses as much as digits as its factorization.

320222921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 320222921 is about 17894.7735666032. The cubic root of 320222921 is about 684.1491707817.

Adding to 320222921 its reverse (129222023), we get a palindrome (449444944).

It can be divided in two parts, 32022 and 2921, that added together give a palindrome (34943).

The spelling of 320222921 in words is "three hundred twenty million, two hundred twenty-two thousand, nine hundred twenty-one".