221646713 has 2 divisors, whose sum is σ = 221646714. Its totient is φ = 221646712.

The previous prime is 221646707. The next prime is 221646721. The reversal of 221646713 is 317646122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162001984 + 59644729 = 12728^2 + 7723^2 .

It is a cyclic number.

It is not a de Polignac number, because 221646713 - 2¹⁴ = 221630329 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221646713.

It is not a weakly prime, because it can be changed into another prime (221646703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110823356 + 110823357.

It is an arithmetic number, because the mean of its divisors is an integer number (110823357).

Almost surely, 2^221646713 is an apocalyptic number.

It is an amenable number.

221646713 is a deficient number, since it is larger than the sum of its proper divisors (1).

221646713 is an equidigital number, since it uses as much as digits as its factorization.

221646713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 221646713 is about 14887.8041698566. The cubic root of 221646713 is about 605.1835274097.

The spelling of 221646713 in words is "two hundred twenty-one million, six hundred forty-six thousand, seven hundred thirteen".