121644321 has 16 divisors (see below), whose sum is σ = 163968000. Its totient is φ = 80213328.

The previous prime is 121644317. The next prime is 121644337. The reversal of 121644321 is 123446121.

It is not a de Polignac number, because 121644321 - 2² = 121644317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121644291 and 121644300.

It is not an unprimeable number, because it can be changed into a prime (121644301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202780 + ... + 203378.

It is an arithmetic number, because the mean of its divisors is an integer number (10248000).

Almost surely, 2^121644321 is an apocalyptic number.

It is an amenable number.

121644321 is a deficient number, since it is larger than the sum of its proper divisors (42323679).

121644321 is a wasteful number, since it uses less digits than its factorization.

121644321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228.

The product of its digits is 1152, while the sum is 24.

The square root of 121644321 is about 11029.2484331436. The cubic root of 121644321 is about 495.4851156821.

The spelling of 121644321 in words is "one hundred twenty-one million, six hundred forty-four thousand, three hundred twenty-one".