213230431331 has 4 divisors (see below), whose sum is σ = 213585224664. Its totient is φ = 212875638000.

The previous prime is 213230431321. The next prime is 213230431387. The reversal of 213230431331 is 133134032312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213230431331 is a prime.

It is a super-2 number, since 2×213230431331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213230431331.

It is not an unprimeable number, because it can be changed into a prime (213230431321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177395765 + ... + 177396966.

It is an arithmetic number, because the mean of its divisors is an integer number (53396306166).

Almost surely, 2^213230431331 is an apocalyptic number.

213230431331 is a deficient number, since it is larger than the sum of its proper divisors (354793333).

213230431331 is an equidigital number, since it uses as much as digits as its factorization.

213230431331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354793332.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 213230431331 its reverse (133134032312), we get a palindrome (346364463643).

The spelling of 213230431331 in words is "two hundred thirteen billion, two hundred thirty million, four hundred thirty-one thousand, three hundred thirty-one".