123011330021 has 4 divisors (see below), whose sum is σ = 123019471692. Its totient is φ = 123003188352.

The previous prime is 123011330003. The next prime is 123011330059. The reversal of 123011330021 is 120033110321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120033110321 = 74623 ⋅1608527.

It can be written as a sum of positive squares in 2 ways, for example, as 28531939396 + 94479390625 = 168914^2 + 307375^2 .

It is a cyclic number.

It is not a de Polignac number, because 123011330021 - 2⁶ = 123011329957 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 (123011330821) 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, 4048130 + ... + 4078403.

It is an arithmetic number, because the mean of its divisors is an integer number (30754867923).

Almost surely, 2^123011330021 is an apocalyptic number.

It is an amenable number.

123011330021 is a deficient number, since it is larger than the sum of its proper divisors (8141671).

123011330021 is an equidigital number, since it uses as much as digits as its factorization.

123011330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8141670.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 123011330021 its reverse (120033110321), we get a palindrome (243044440342).

The spelling of 123011330021 in words is "one hundred twenty-three billion, eleven million, three hundred thirty thousand, twenty-one".