12052961721 has 6 divisors (see below), whose sum is σ = 17409833610. Its totient is φ = 8035307808.

The previous prime is 12052961647. The next prime is 12052961729. The reversal of 12052961721 is 12716925021.

12052961721 is a `hidden beast` number, since 1 + 2 + 0 + 529 + 61 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6219057321 + 5833904400 = 78861^2 + 76380^2 .

It is not a de Polignac number, because 12052961721 - 2¹⁷ = 12052830649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12052961729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 669608976 + ... + 669608993.

It is an arithmetic number, because the mean of its divisors is an integer number (2901638935).

Almost surely, 2^12052961721 is an apocalyptic number.

It is an amenable number.

12052961721 is a deficient number, since it is larger than the sum of its proper divisors (5356871889).

12052961721 is a wasteful number, since it uses less digits than its factorization.

12052961721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339217975 (or 1339217972 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 12052961721 in words is "twelve billion, fifty-two million, nine hundred sixty-one thousand, seven hundred twenty-one".