221298713 has 2 divisors, whose sum is σ = 221298714. Its totient is φ = 221298712.

The previous prime is 221298661. The next prime is 221298731. The reversal of 221298713 is 317892122.

Together with next prime (221298731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220314649 + 984064 = 14843^2 + 992^2 .

It is a cyclic number.

It is not a de Polignac number, because 221298713 - 2¹⁰ = 221297689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221295713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110649356 + 110649357.

It is an arithmetic number, because the mean of its divisors is an integer number (110649357).

Almost surely, 2^221298713 is an apocalyptic number.

It is an amenable number.

221298713 is a deficient number, since it is larger than the sum of its proper divisors (1).

221298713 is an equidigital number, since it uses as much as digits as its factorization.

221298713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 221298713 is about 14876.1121601042. The cubic root of 221298713 is about 604.8666354489.

The spelling of 221298713 in words is "two hundred twenty-one million, two hundred ninety-eight thousand, seven hundred thirteen".