12007032721 has 8 divisors (see below), whose sum is σ = 12048411240. Its totient is φ = 11965696512.

The previous prime is 12007032673. The next prime is 12007032743. The reversal of 12007032721 is 12723070021.

It can be written as a sum of positive squares in 4 ways, for example, as 635796225 + 11371236496 = 25215^2 + 106636^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12007032721 - 2⁹ = 12007032209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12007032761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622011 + ... + 641023.

It is an arithmetic number, because the mean of its divisors is an integer number (1506051405).

Almost surely, 2^12007032721 is an apocalyptic number.

It is an amenable number.

12007032721 is a deficient number, since it is larger than the sum of its proper divisors (41378519).

12007032721 is a wasteful number, since it uses less digits than its factorization.

12007032721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21155.

The product of its (nonzero) digits is 1176, while the sum is 25.

The spelling of 12007032721 in words is "twelve billion, seven million, thirty-two thousand, seven hundred twenty-one".