221266613 has 2 divisors, whose sum is σ = 221266614. Its totient is φ = 221266612.

The previous prime is 221266541. The next prime is 221266673. The reversal of 221266613 is 316662122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113252164 + 108014449 = 10642^2 + 10393^2 .

It is a cyclic number.

It is not a de Polignac number, because 221266613 - 2¹⁴ = 221250229 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221266673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110633306 + 110633307.

It is an arithmetic number, because the mean of its divisors is an integer number (110633307).

Almost surely, 2^221266613 is an apocalyptic number.

It is an amenable number.

221266613 is a deficient number, since it is larger than the sum of its proper divisors (1).

221266613 is an equidigital number, since it uses as much as digits as its factorization.

221266613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 221266613 is about 14875.0332100470. The cubic root of 221266613 is about 604.8373881665.

The spelling of 221266613 in words is "two hundred twenty-one million, two hundred sixty-six thousand, six hundred thirteen".