213320437 has 12 divisors (see below), whose sum is σ = 247211136. Its totient is φ = 182517440.

The previous prime is 213320413. The next prime is 213320441. The reversal of 213320437 is 734023312.

It is not a de Polignac number, because 213320437 - 2²³ = 204931829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213320447) 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, 30373 + ... + 36730.

It is an arithmetic number, because the mean of its divisors is an integer number (20600928).

Almost surely, 2^213320437 is an apocalyptic number.

It is an amenable number.

213320437 is a deficient number, since it is larger than the sum of its proper divisors (33890699).

213320437 is a wasteful number, since it uses less digits than its factorization.

213320437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67148 (or 67131 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 25.

The square root of 213320437 is about 14605.4933843400. The cubic root of 213320437 is about 597.5085922797.

Adding to 213320437 its reverse (734023312), we get a palindrome (947343749).

The spelling of 213320437 in words is "two hundred thirteen million, three hundred twenty thousand, four hundred thirty-seven".