12701212721 has 2 divisors, whose sum is σ = 12701212722. Its totient is φ = 12701212720.

The previous prime is 12701212673. The next prime is 12701212729. The reversal of 12701212721 is 12721210721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12660750400 + 40462321 = 112520^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 12701212721 - 2¹⁰ = 12701211697 is a prime.

It is a super-2 number, since 2×12701212721² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (12701212729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6350606360 + 6350606361.

It is an arithmetic number, because the mean of its divisors is an integer number (6350606361).

Almost surely, 2^12701212721 is an apocalyptic number.

It is an amenable number.

12701212721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12701212721 is an equidigital number, since it uses as much as digits as its factorization.

12701212721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 26.

The spelling of 12701212721 in words is "twelve billion, seven hundred one million, two hundred twelve thousand, seven hundred twenty-one".