313021421 has 4 divisors (see below), whose sum is σ = 326631072. Its totient is φ = 299411772.

The previous prime is 313021367. The next prime is 313021433. The reversal of 313021421 is 124120313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313021421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 313021421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313024421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6804791 + ... + 6804836.

It is an arithmetic number, because the mean of its divisors is an integer number (81657768).

Almost surely, 2^313021421 is an apocalyptic number.

It is an amenable number.

313021421 is a deficient number, since it is larger than the sum of its proper divisors (13609651).

313021421 is a wasteful number, since it uses less digits than its factorization.

313021421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13609650.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 313021421 is about 17692.4113958499. The cubic root of 313021421 is about 678.9816222505.

Adding to 313021421 its reverse (124120313), we get a palindrome (437141734).

It can be divided in two parts, 31302 and 1421, that added together give a palindrome (32723).

The spelling of 313021421 in words is "three hundred thirteen million, twenty-one thousand, four hundred twenty-one".