12000010721 has 2 divisors, whose sum is σ = 12000010722. Its totient is φ = 12000010720.

The previous prime is 12000010699. The next prime is 12000010723. The reversal of 12000010721 is 12701000021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6870586321 + 5129424400 = 82889^2 + 71620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12000010721 is a prime.

It is a super-2 number, since 2×12000010721² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 12000010723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12000010696 and 12000010705.

It is not a weakly prime, because it can be changed into another prime (12000010723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000005360 + 6000005361.

It is an arithmetic number, because the mean of its divisors is an integer number (6000005361).

Almost surely, 2^12000010721 is an apocalyptic number.

It is an amenable number.

12000010721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12000010721 is an equidigital number, since it uses as much as digits as its factorization.

12000010721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

Adding to 12000010721 its reverse (12701000021), we get a palindrome (24701010742).

The spelling of 12000010721 in words is "twelve billion, ten thousand, seven hundred twenty-one".