213431320 has 32 divisors (see below), whose sum is σ = 488365200. Its totient is φ = 83924608.

The previous prime is 213431291. The next prime is 213431321. The reversal of 213431320 is 23134312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213431321) 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, 42859 + ... + 47578.

Almost surely, 2^213431320 is an apocalyptic number.

213431320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213431320 is an abundant number, since it is smaller than the sum of its proper divisors (274933880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213431320 is a wasteful number, since it uses less digits than its factorization.

213431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90507 (or 90503 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 213431320 is about 14609.2888259491. The cubic root of 213431320 is about 597.6121017700.

Adding to 213431320 its reverse (23134312), we get a palindrome (236565632).

The spelling of 213431320 in words is "two hundred thirteen million, four hundred thirty-one thousand, three hundred twenty".