310221421 has 2 divisors, whose sum is σ = 310221422. Its totient is φ = 310221420.

The previous prime is 310221419. The next prime is 310221449. The reversal of 310221421 is 124122013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200788900 + 109432521 = 14170^2 + 10461^2 .

It is a cyclic number.

It is not a de Polignac number, because 310221421 - 2¹ = 310221419 is a prime.

Together with 310221419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 310221395 and 310221404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (310222421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155110710 + 155110711.

It is an arithmetic number, because the mean of its divisors is an integer number (155110711).

Almost surely, 2^310221421 is an apocalyptic number.

It is an amenable number.

310221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

310221421 is an equidigital number, since it uses as much as digits as its factorization.

310221421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 310221421 is about 17613.1036731179. The cubic root of 310221421 is about 676.9510418149.

Adding to 310221421 its reverse (124122013), we get a palindrome (434343434).

The spelling of 310221421 in words is "three hundred ten million, two hundred twenty-one thousand, four hundred twenty-one".