123321009 has 48 divisors (see below), whose sum is σ = 208317312. Its totient is φ = 63343104.

The previous prime is 123320999. The next prime is 123321041. The reversal of 123321009 is 900123321.

It is a happy number.

It is not a de Polignac number, because 123321009 - 2⁸ = 123320753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (123321049) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 188527 + ... + 189179.

It is an arithmetic number, because the mean of its divisors is an integer number (4339944).

Almost surely, 2^123321009 is an apocalyptic number.

It is an amenable number.

123321009 is a deficient number, since it is larger than the sum of its proper divisors (84996303).

123321009 is a wasteful number, since it uses less digits than its factorization.

123321009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 123321009 is about 11104.9992796038. Note that the first 3 decimals coincide. The cubic root of 123321009 is about 497.7512467129.

The spelling of 123321009 in words is "one hundred twenty-three million, three hundred twenty-one thousand, nine".