213123323311 has 4 divisors (see below), whose sum is σ = 215320471072. Its totient is φ = 210926175552.

The previous prime is 213123323279. The next prime is 213123323333. The reversal of 213123323311 is 113323321312.

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 213123323311 - 2⁵ = 213123323279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123323381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1098573735 + ... + 1098573928.

It is an arithmetic number, because the mean of its divisors is an integer number (53830117768).

Almost surely, 2^213123323311 is an apocalyptic number.

213123323311 is a deficient number, since it is larger than the sum of its proper divisors (2197147761).

213123323311 is an equidigital number, since it uses as much as digits as its factorization.

213123323311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2197147760.

The product of its digits is 1944, while the sum is 25.

Adding to 213123323311 its reverse (113323321312), we get a palindrome (326446644623).

The spelling of 213123323311 in words is "two hundred thirteen billion, one hundred twenty-three million, three hundred twenty-three thousand, three hundred eleven".