313220421 has 12 divisors (see below), whose sum is σ = 459847180. Its totient is φ = 205390080.

The previous prime is 313220419. The next prime is 313220423. The reversal of 313220421 is 124022313.

It is an interprime number because it is at equal distance from previous prime (313220419) and next prime (313220423).

It can be written as a sum of positive squares in 2 ways, for example, as 141348321 + 171872100 = 11889^2 + 13110^2 .

It is not a de Polignac number, because 313220421 - 2¹ = 313220419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313220394 and 313220403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313220423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 284716 + ... + 285813.

Almost surely, 2^313220421 is an apocalyptic number.

It is an amenable number.

313220421 is a deficient number, since it is larger than the sum of its proper divisors (146626759).

313220421 is a wasteful number, since it uses less digits than its factorization.

313220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570596 (or 570593 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 313220421 is about 17698.0343823827. The cubic root of 313220421 is about 679.1254768568.

Adding to 313220421 its reverse (124022313), we get a palindrome (437242734).

The spelling of 313220421 in words is "three hundred thirteen million, two hundred twenty thousand, four hundred twenty-one".