123322443421 has 4 divisors (see below), whose sum is σ = 127574941500. Its totient is φ = 119069945344.

The previous prime is 123322443371. The next prime is 123322443437. The reversal of 123322443421 is 124344223321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124344223321 = 631 ⋅197058991.

It can be written as a sum of positive squares in 2 ways, for example, as 82490158521 + 40832284900 = 287211^2 + 202070^2 .

It is a cyclic number.

It is not a de Polignac number, because 123322443421 - 2²³ = 123314054813 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 (123322443451) 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, 2126248996 + ... + 2126249053.

It is an arithmetic number, because the mean of its divisors is an integer number (31893735375).

Almost surely, 2^123322443421 is an apocalyptic number.

It is an amenable number.

123322443421 is a deficient number, since it is larger than the sum of its proper divisors (4252498079).

123322443421 is an equidigital number, since it uses as much as digits as its factorization.

123322443421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252498078.

The product of its digits is 27648, while the sum is 31.

Adding to 123322443421 its reverse (124344223321), we get a palindrome (247666666742).

The spelling of 123322443421 in words is "one hundred twenty-three billion, three hundred twenty-two million, four hundred forty-three thousand, four hundred twenty-one".