313730021 has 16 divisors (see below), whose sum is σ = 351267840. Its totient is φ = 277735920.

The previous prime is 313730009. The next prime is 313730023. The reversal of 313730021 is 120037313.

It is a happy number.

It is not a de Polignac number, because 313730021 - 2¹⁰ = 313728997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 313729975 and 313730002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313730023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197396 + ... + 198978.

It is an arithmetic number, because the mean of its divisors is an integer number (21954240).

Almost surely, 2^313730021 is an apocalyptic number.

It is an amenable number.

313730021 is a deficient number, since it is larger than the sum of its proper divisors (37537819).

313730021 is a wasteful number, since it uses less digits than its factorization.

313730021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 313730021 is about 17712.4256102884. The cubic root of 313730021 is about 679.4935827239.

Adding to 313730021 its reverse (120037313), we get a palindrome (433767334).

The spelling of 313730021 in words is "three hundred thirteen million, seven hundred thirty thousand, twenty-one".