123331212013 has 4 divisors (see below), whose sum is σ = 123661859068. Its totient is φ = 123000564960.

The previous prime is 123331211909. The next prime is 123331212029. The reversal of 123331212013 is 310212133321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310212133321 = 127 ⋅2442615223.

It can be written as a sum of positive squares in 2 ways, for example, as 64717833609 + 58613378404 = 254397^2 + 242102^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123331212013 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 (123431212013) 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, 165322968 + ... + 165323713.

It is an arithmetic number, because the mean of its divisors is an integer number (30915464767).

Almost surely, 2^123331212013 is an apocalyptic number.

It is an amenable number.

123331212013 is a deficient number, since it is larger than the sum of its proper divisors (330647055).

123331212013 is an equidigital number, since it uses as much as digits as its factorization.

123331212013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330647054.

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

Adding to 123331212013 its reverse (310212133321), we get a palindrome (433543345334).

The spelling of 123331212013 in words is "one hundred twenty-three billion, three hundred thirty-one million, two hundred twelve thousand, thirteen".