123013521331 has 4 divisors (see below), whose sum is σ = 123023012200. Its totient is φ = 123004030464.

The previous prime is 123013521289. The next prime is 123013521353. The reversal of 123013521331 is 133125310321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133125310321 = 101917 ⋅1306213.

It is a cyclic number.

It is not a de Polignac number, because 123013521331 - 2¹⁹ = 123012997043 is a prime.

It is a super-2 number, since 2×123013521331² (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 = 123013521296 and 123013521305.

It is not an unprimeable number, because it can be changed into a prime (123013531331) 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, 4725966 + ... + 4751923.

It is an arithmetic number, because the mean of its divisors is an integer number (30755753050).

Almost surely, 2^123013521331 is an apocalyptic number.

123013521331 is a deficient number, since it is larger than the sum of its proper divisors (9490869).

123013521331 is an equidigital number, since it uses as much as digits as its factorization.

123013521331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9490868.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 123013521331 its reverse (133125310321), we get a palindrome (256138831652).

The spelling of 123013521331 in words is "one hundred twenty-three billion, thirteen million, five hundred twenty-one thousand, three hundred thirty-one".