221244887 has 2 divisors, whose sum is σ = 221244888. Its totient is φ = 221244886.

The previous prime is 221244827. The next prime is 221244913. The reversal of 221244887 is 788442122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221244887 - 2¹⁴ = 221228503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221244887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221244827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110622443 + 110622444.

It is an arithmetic number, because the mean of its divisors is an integer number (110622444).

Almost surely, 2^221244887 is an apocalyptic number.

221244887 is a deficient number, since it is larger than the sum of its proper divisors (1).

221244887 is an equidigital number, since it uses as much as digits as its factorization.

221244887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57344, while the sum is 38.

The square root of 221244887 is about 14874.3029080357. The cubic root of 221244887 is about 604.8175913446.

The spelling of 221244887 in words is "two hundred twenty-one million, two hundred forty-four thousand, eight hundred eighty-seven".