12740381021 has 2 divisors, whose sum is σ = 12740381022. Its totient is φ = 12740381020.

The previous prime is 12740380979. The next prime is 12740381057. The reversal of 12740381021 is 12018304721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12125092996 + 615288025 = 110114^2 + 24805^2 .

It is a cyclic number.

It is not a de Polignac number, because 12740381021 - 2¹⁰ = 12740379997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12740381221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6370190510 + 6370190511.

It is an arithmetic number, because the mean of its divisors is an integer number (6370190511).

Almost surely, 2^12740381021 is an apocalyptic number.

It is an amenable number.

12740381021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12740381021 is an equidigital number, since it uses as much as digits as its factorization.

12740381021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

Adding to 12740381021 its reverse (12018304721), we get a palindrome (24758685742).

The spelling of 12740381021 in words is "twelve billion, seven hundred forty million, three hundred eighty-one thousand, twenty-one".