213131403 has 12 divisors (see below), whose sum is σ = 308844120. Its totient is φ = 141631776.

The previous prime is 213131393. The next prime is 213131437. The reversal of 213131403 is 304131312.

It is not a de Polignac number, because 213131403 - 2⁵ = 213131371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213131453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35013 + ... + 40646.

It is an arithmetic number, because the mean of its divisors is an integer number (25737010).

Almost surely, 2^213131403 is an apocalyptic number.

213131403 is a deficient number, since it is larger than the sum of its proper divisors (95712717).

213131403 is a wasteful number, since it uses less digits than its factorization.

213131403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75978 (or 75975 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 213131403 is about 14599.0206178360. The cubic root of 213131403 is about 597.3320459524.

Adding to 213131403 its reverse (304131312), we get a palindrome (517262715).

Subtracting 213131403 from its reverse (304131312), we obtain a palindrome (90999909).

The spelling of 213131403 in words is "two hundred thirteen million, one hundred thirty-one thousand, four hundred three".