12721261507 has 2 divisors, whose sum is σ = 12721261508. Its totient is φ = 12721261506.

The previous prime is 12721261499. The next prime is 12721261549. The reversal of 12721261507 is 70516212721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12721261507 - 2³ = 12721261499 is a prime.

It is a super-2 number, since 2×12721261507² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12421261507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360630753 + 6360630754.

It is an arithmetic number, because the mean of its divisors is an integer number (6360630754).

Almost surely, 2^12721261507 is an apocalyptic number.

12721261507 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721261507 is an equidigital number, since it uses as much as digits as its factorization.

12721261507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 12721261507 in words is "twelve billion, seven hundred twenty-one million, two hundred sixty-one thousand, five hundred seven".