1200664321 has 32 divisors (see below), whose sum is σ = 1373328000. Its totient is φ = 1042854912.

The previous prime is 1200664291. The next prime is 1200664373. The reversal of 1200664321 is 1234660021.

It is a cyclic number.

It is not a de Polignac number, because 1200664321 - 2⁹ = 1200663809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200664721) 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 31 ways as a sum of consecutive naturals, for example, 2358615 + ... + 2359123.

It is an arithmetic number, because the mean of its divisors is an integer number (42916500).

Almost surely, 2^1200664321 is an apocalyptic number.

It is an amenable number.

1200664321 is a deficient number, since it is larger than the sum of its proper divisors (172663679).

1200664321 is a wasteful number, since it uses less digits than its factorization.

1200664321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1200664321 is about 34650.6034723784. The cubic root of 1200664321 is about 1062.8546292305.

The spelling of 1200664321 in words is "one billion, two hundred million, six hundred sixty-four thousand, three hundred twenty-one".