121664321 has 8 divisors (see below), whose sum is σ = 123100224. Its totient is φ = 120233520.

The previous prime is 121664303. The next prime is 121664327. The reversal of 121664321 is 123466121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121664321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121664327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67190 + ... + 68976.

It is an arithmetic number, because the mean of its divisors is an integer number (15387528).

Almost surely, 2^121664321 is an apocalyptic number.

It is an amenable number.

121664321 is a deficient number, since it is larger than the sum of its proper divisors (1435903).

121664321 is a wasteful number, since it uses less digits than its factorization.

121664321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551.

The product of its digits is 1728, while the sum is 26.

The square root of 121664321 is about 11030.1550759724. The cubic root of 121664321 is about 495.5122690508.

The spelling of 121664321 in words is "one hundred twenty-one million, six hundred sixty-four thousand, three hundred twenty-one".