213133231331 has 16 divisors (see below), whose sum is σ = 216347120640. Its totient is φ = 209935730880.

The previous prime is 213133231321. The next prime is 213133231357. The reversal of 213133231331 is 133132331312.

It is a cyclic number.

It is not a de Polignac number, because 213133231331 - 2³⁰ = 212059489507 is a prime.

It is a super-2 number, since 2×213133231331² (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 213133231331.

It is not an unprimeable number, because it can be changed into a prime (213133231321) 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, 46421846 + ... + 46426436.

It is an arithmetic number, because the mean of its divisors is an integer number (13521695040).

Almost surely, 2^213133231331 is an apocalyptic number.

213133231331 is a deficient number, since it is larger than the sum of its proper divisors (3213889309).

213133231331 is an equidigital number, since it uses as much as digits as its factorization.

213133231331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226.

The product of its digits is 2916, while the sum is 26.

Adding to 213133231331 its reverse (133132331312), we get a palindrome (346265562643).

The spelling of 213133231331 in words is "two hundred thirteen billion, one hundred thirty-three million, two hundred thirty-one thousand, three hundred thirty-one".