13812280721 has 2 divisors, whose sum is σ = 13812280722. Its totient is φ = 13812280720.

The previous prime is 13812280693. The next prime is 13812280753. The reversal of 13812280721 is 12708221831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13761870721 + 50410000 = 117311^2 + 7100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13812280721 is a prime.

It is not a weakly prime, because it can be changed into another prime (13812280771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6906140360 + 6906140361.

It is an arithmetic number, because the mean of its divisors is an integer number (6906140361).

Almost surely, 2^13812280721 is an apocalyptic number.

It is an amenable number.

13812280721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13812280721 is an equidigital number, since it uses as much as digits as its factorization.

13812280721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The spelling of 13812280721 in words is "thirteen billion, eight hundred twelve million, two hundred eighty thousand, seven hundred twenty-one".