123321031213 has 4 divisors (see below), whose sum is σ = 123453778140. Its totient is φ = 123188284288.

The previous prime is 123321031187. The next prime is 123321031261. The reversal of 123321031213 is 312130123321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1200137449 + 122120893764 = 34643^2 + 349458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123321031213 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 (123321031313) 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, 66372070 + ... + 66373927.

It is an arithmetic number, because the mean of its divisors is an integer number (30863444535).

Almost surely, 2^123321031213 is an apocalyptic number.

It is an amenable number.

123321031213 is a deficient number, since it is larger than the sum of its proper divisors (132746927).

123321031213 is an equidigital number, since it uses as much as digits as its factorization.

123321031213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132746926.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 123321031213 its reverse (312130123321), we get a palindrome (435451154534).

The spelling of 123321031213 in words is "one hundred twenty-three billion, three hundred twenty-one million, thirty-one thousand, two hundred thirteen".