123311021013 has 6 divisors (see below), whose sum is σ = 178115919254. Its totient is φ = 82207347336.

The previous prime is 123311020981. The next prime is 123311021069. The reversal of 123311021013 is 310120113321.

It can be written as a sum of positive squares in only one way, i.e., 122498600004 + 812421009 = 349998^2 + 28503^2 .

It is not a de Polignac number, because 123311021013 - 2⁵ = 123311020981 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 (123311021213) 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 5 ways as a sum of consecutive naturals, for example, 6850612270 + ... + 6850612287.

Almost surely, 2^123311021013 is an apocalyptic number.

It is an amenable number.

123311021013 is a deficient number, since it is larger than the sum of its proper divisors (54804898241).

123311021013 is a wasteful number, since it uses less digits than its factorization.

123311021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13701224563 (or 13701224560 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 123311021013 its reverse (310120113321), we get a palindrome (433431134334).

The spelling of 123311021013 in words is "one hundred twenty-three billion, three hundred eleven million, twenty-one thousand, thirteen".