313340021 has 2 divisors, whose sum is σ = 313340022. Its totient is φ = 313340020.

The previous prime is 313340003. The next prime is 313340047. The reversal of 313340021 is 120043313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217887121 + 95452900 = 14761^2 + 9770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313340021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313340221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156670010 + 156670011.

It is an arithmetic number, because the mean of its divisors is an integer number (156670011).

Almost surely, 2^313340021 is an apocalyptic number.

It is an amenable number.

313340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

313340021 is an equidigital number, since it uses as much as digits as its factorization.

313340021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 313340021 is about 17701.4129662013. The cubic root of 313340021 is about 679.2119048860.

Adding to 313340021 its reverse (120043313), we get a palindrome (433383334).

The spelling of 313340021 in words is "three hundred thirteen million, three hundred forty thousand, twenty-one".