123421209 has 8 divisors (see below), whose sum is σ = 165652032. Its totient is φ = 81735600.

The previous prime is 123421171. The next prime is 123421211. The reversal of 123421209 is 902124321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123421209 - 2²⁰ = 122372633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123421219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135774 + ... + 136679.

It is an arithmetic number, because the mean of its divisors is an integer number (20706504).

Almost surely, 2^123421209 is an apocalyptic number.

It is an amenable number.

123421209 is a deficient number, since it is larger than the sum of its proper divisors (42230823).

123421209 is a wasteful number, since it uses less digits than its factorization.

123421209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272607.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 123421209 is about 11109.5098451732. The cubic root of 123421209 is about 497.8860201076.

The spelling of 123421209 in words is "one hundred twenty-three million, four hundred twenty-one thousand, two hundred nine".