123113021331 has 4 divisors (see below), whose sum is σ = 164150695112. Its totient is φ = 82075347552.

The previous prime is 123113021329. The next prime is 123113021347. The reversal of 123113021331 is 133120311321.

It is a happy number.

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

It is not a de Polignac number, because 123113021331 - 2¹ = 123113021329 is a prime.

It is a super-2 number, since 2×123113021331² (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 = 123113021298 and 123113021307.

It is not an unprimeable number, because it can be changed into a prime (123113021321) 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, 20518836886 + ... + 20518836891.

It is an arithmetic number, because the mean of its divisors is an integer number (41037673778).

Almost surely, 2^123113021331 is an apocalyptic number.

123113021331 is a deficient number, since it is larger than the sum of its proper divisors (41037673781).

123113021331 is an equidigital number, since it uses as much as digits as its factorization.

123113021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41037673780.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 123113021331 its reverse (133120311321), we get a palindrome (256233332652).

The spelling of 123113021331 in words is "one hundred twenty-three billion, one hundred thirteen million, twenty-one thousand, three hundred thirty-one".