123131421023 has 4 divisors (see below), whose sum is σ = 132603068808. Its totient is φ = 113659773240.

The previous prime is 123131421011. The next prime is 123131421041. The reversal of 123131421023 is 320124131321.

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

It is not a de Polignac number, because 123131421023 - 2⁶ = 123131420959 is a prime.

It is a super-2 number, since 2×123131421023² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123131421023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131421053) 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, 4735823873 + ... + 4735823898.

It is an arithmetic number, because the mean of its divisors is an integer number (33150767202).

Almost surely, 2^123131421023 is an apocalyptic number.

123131421023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123131421023 is a deficient number, since it is larger than the sum of its proper divisors (9471647785).

123131421023 is an equidigital number, since it uses as much as digits as its factorization.

123131421023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471647784.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 123131421023 its reverse (320124131321), we get a palindrome (443255552344).

The spelling of 123131421023 in words is "one hundred twenty-three billion, one hundred thirty-one million, four hundred twenty-one thousand, twenty-three".