12056407721 has 2 divisors, whose sum is σ = 12056407722. Its totient is φ = 12056407720.

The previous prime is 12056407679. The next prime is 12056407733. The reversal of 12056407721 is 12770465021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6240210025 + 5816197696 = 78995^2 + 76264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12056407721 is a prime.

It is not a weakly prime, because it can be changed into another prime (12056407751) 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 as a sum of consecutive naturals, namely, 6028203860 + 6028203861.

It is an arithmetic number, because the mean of its divisors is an integer number (6028203861).

Almost surely, 2^12056407721 is an apocalyptic number.

It is an amenable number.

12056407721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12056407721 is an equidigital number, since it uses as much as digits as its factorization.

12056407721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 12056407721 in words is "twelve billion, fifty-six million, four hundred seven thousand, seven hundred twenty-one".