123131103021 has 16 divisors (see below), whose sum is σ = 182604352320. Its totient is φ = 82002845520.

The previous prime is 123131103001. The next prime is 123131103097. The reversal of 123131103021 is 120301131321.

It is a de Polignac number, because none of the positive numbers 2^k-123131103021 is a prime.

It is a super-2 number, since 2×123131103021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123131102985 and 123131103003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131103001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2322090 + ... + 2374523.

It is an arithmetic number, because the mean of its divisors is an integer number (11412772020).

Almost surely, 2^123131103021 is an apocalyptic number.

It is an amenable number.

123131103021 is a deficient number, since it is larger than the sum of its proper divisors (59473249299).

123131103021 is an equidigital number, since it uses as much as digits as its factorization.

123131103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697593 (or 4697587 counting only the distinct ones).

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

Adding to 123131103021 its reverse (120301131321), we get a palindrome (243432234342).

The spelling of 123131103021 in words is "one hundred twenty-three billion, one hundred thirty-one million, one hundred three thousand, twenty-one".