310340021 has 2 divisors, whose sum is σ = 310340022. Its totient is φ = 310340020.

The previous prime is 310340011. The next prime is 310340057. The reversal of 310340021 is 120043013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310252996 + 87025 = 17614^2 + 295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-310340021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 310339978 and 310340005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (310340011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155170010 + 155170011.

It is an arithmetic number, because the mean of its divisors is an integer number (155170011).

Almost surely, 2^310340021 is an apocalyptic number.

It is an amenable number.

310340021 is a deficient number, since it is larger than the sum of its proper divisors (1).

310340021 is an equidigital number, since it uses as much as digits as its factorization.

310340021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 310340021 is about 17616.4701628902. The cubic root of 310340021 is about 677.0372986613.

Adding to 310340021 its reverse (120043013), we get a palindrome (430383034).

The spelling of 310340021 in words is "three hundred ten million, three hundred forty thousand, twenty-one".