123032123021 has 4 divisors (see below), whose sum is σ = 123299004444. Its totient is φ = 122765241600.

The previous prime is 123032122909. The next prime is 123032123023. The reversal of 123032123021 is 120321230321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120321230321 = 43 ⋅2798168147.

It can be written as a sum of positive squares in 2 ways, for example, as 27959184100 + 95072938921 = 167210^2 + 308339^2 .

It is a cyclic number.

It is not a de Polignac number, because 123032123021 - 2¹⁰ = 123032121997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123032122984 and 123032123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123032123023) 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, 133440020 + ... + 133440941.

It is an arithmetic number, because the mean of its divisors is an integer number (30824751111).

Almost surely, 2^123032123021 is an apocalyptic number.

It is an amenable number.

123032123021 is a deficient number, since it is larger than the sum of its proper divisors (266881423).

123032123021 is an equidigital number, since it uses as much as digits as its factorization.

123032123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266881422.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123032123021 its reverse (120321230321), we get a palindrome (243353353342).

The spelling of 123032123021 in words is "one hundred twenty-three billion, thirty-two million, one hundred twenty-three thousand, twenty-one".