213122232331 has 4 divisors (see below), whose sum is σ = 213453682792. Its totient is φ = 212790781872.

The previous prime is 213122232329. The next prime is 213122232341. The reversal of 213122232331 is 133232221312.

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

It is a cyclic number.

It is not a de Polignac number, because 213122232331 - 2¹ = 213122232329 is a prime.

It is a super-2 number, since 2×213122232331² (a number of 23 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 = 213122232296 and 213122232305.

It is not an unprimeable number, because it can be changed into a prime (213122232341) 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, 165724266 + ... + 165725551.

It is an arithmetic number, because the mean of its divisors is an integer number (53363420698).

Almost surely, 2^213122232331 is an apocalyptic number.

213122232331 is a deficient number, since it is larger than the sum of its proper divisors (331450461).

213122232331 is an equidigital number, since it uses as much as digits as its factorization.

213122232331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331450460.

The product of its digits is 2592, while the sum is 25.

Adding to 213122232331 its reverse (133232221312), we get a palindrome (346354453643).

The spelling of 213122232331 in words is "two hundred thirteen billion, one hundred twenty-two million, two hundred thirty-two thousand, three hundred thirty-one".