313213521 has 8 divisors (see below), whose sum is σ = 417849184. Its totient is φ = 208693440.

The previous prime is 313213519. The next prime is 313213561. The reversal of 313213521 is 125312313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 313213521 - 2¹ = 313213519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313213501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22360 + ... + 33561.

It is an arithmetic number, because the mean of its divisors is an integer number (52231148).

Almost surely, 2^313213521 is an apocalyptic number.

It is an amenable number.

313213521 is a deficient number, since it is larger than the sum of its proper divisors (104635663).

313213521 is a wasteful number, since it uses less digits than its factorization.

313213521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57791.

The product of its digits is 540, while the sum is 21.

The square root of 313213521 is about 17697.8394444068. The cubic root of 313213521 is about 679.1204899531.

Adding to 313213521 its reverse (125312313), we get a palindrome (438525834).

It can be divided in two parts, 3132 and 13521, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 313213521 in words is "three hundred thirteen million, two hundred thirteen thousand, five hundred twenty-one".