213211312321331 has 4 divisors (see below), whose sum is σ = 213507851004000. Its totient is φ = 212914773638664.

The previous prime is 213211312321253. The next prime is 213211312321363. The reversal of 213211312321331 is 133123213112312.

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-213211312321331 is a prime.

It is a super-2 number, since 2×213211312321331² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213211312321294 and 213211312321303.

It is not an unprimeable number, because it can be changed into a prime (213211312311331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148269340256 + ... + 148269341693.

It is an arithmetic number, because the mean of its divisors is an integer number (53376962751000).

Almost surely, 2^{213211312321331} is an apocalyptic number.

213211312321331 is a deficient number, since it is larger than the sum of its proper divisors (296538682669).

213211312321331 is an equidigital number, since it uses as much as digits as its factorization.

213211312321331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296538682668.

The product of its digits is 3888, while the sum is 29.

Adding to 213211312321331 its reverse (133123213112312), we get a palindrome (346334525433643).

The spelling of 213211312321331 in words is "two hundred thirteen trillion, two hundred eleven billion, three hundred twelve million, three hundred twenty-one thousand, three hundred thirty-one".