319246021 has 2 divisors, whose sum is σ = 319246022. Its totient is φ = 319246020.

The previous prime is 319246019. The next prime is 319246063. The reversal of 319246021 is 120642913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196280100 + 122965921 = 14010^2 + 11089^2 .

It is a cyclic number.

It is not a de Polignac number, because 319246021 - 2¹ = 319246019 is a prime.

Together with 319246019, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319240021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159623010 + 159623011.

It is an arithmetic number, because the mean of its divisors is an integer number (159623011).

Almost surely, 2^319246021 is an apocalyptic number.

It is an amenable number.

319246021 is a deficient number, since it is larger than the sum of its proper divisors (1).

319246021 is an equidigital number, since it uses as much as digits as its factorization.

319246021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 319246021 is about 17867.4570378664. The cubic root of 319246021 is about 683.4527537205.

Adding to 319246021 its reverse (120642913), we get a palindrome (439888934).

The spelling of 319246021 in words is "three hundred nineteen million, two hundred forty-six thousand, twenty-one".