123423321021 has 96 divisors (see below), whose sum is σ = 228174870528. Its totient is φ = 57583768320.

The previous prime is 123423321019. The next prime is 123423321031. The reversal of 123423321021 is 120123324321.

It is not a de Polignac number, because 123423321021 - 2¹ = 123423321019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123423320982 and 123423321000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123423321031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1401720 + ... + 1487166.

It is an arithmetic number, because the mean of its divisors is an integer number (2376821568).

Almost surely, 2^123423321021 is an apocalyptic number.

123423321021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123423321021 is a deficient number, since it is larger than the sum of its proper divisors (104751549507).

123423321021 is a wasteful number, since it uses less digits than its factorization.

123423321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85531 (or 85518 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 123423321021 its reverse (120123324321), we get a palindrome (243546645342).

It can be divided in two parts, 123423 and 321021, that added together give a palindrome (444444).

The spelling of 123423321021 in words is "one hundred twenty-three billion, four hundred twenty-three million, three hundred twenty-one thousand, twenty-one".