213440331 has 16 divisors (see below), whose sum is σ = 307250720. Its totient is φ = 131016960.

The previous prime is 213440323. The next prime is 213440333. The reversal of 213440331 is 133044312.

It is not a de Polignac number, because 213440331 - 2³ = 213440323 is a prime.

It is a super-2 number, since 2×213440331² = 91113549794779122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213440298 and 213440307.

It is not an unprimeable number, because it can be changed into a prime (213440333) 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, 9261 + ... + 22641.

It is an arithmetic number, because the mean of its divisors is an integer number (19203170).

Almost surely, 2^213440331 is an apocalyptic number.

213440331 is a deficient number, since it is larger than the sum of its proper divisors (93810389).

213440331 is a wasteful number, since it uses less digits than its factorization.

213440331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13806.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 213440331 is about 14609.5972223741. The cubic root of 213440331 is about 597.6205119803.

Adding to 213440331 its reverse (133044312), we get a palindrome (346484643).

The spelling of 213440331 in words is "two hundred thirteen million, four hundred forty thousand, three hundred thirty-one".