221070917 has 4 divisors (see below), whose sum is σ = 230682720. Its totient is φ = 211459116.

The previous prime is 221070901. The next prime is 221070919. The reversal of 221070917 is 719070122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 719070122 = 2 ⋅359535061.

It is a cyclic number.

It is not a de Polignac number, because 221070917 - 2⁴ = 221070901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221070917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221070919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4805867 + ... + 4805912.

It is an arithmetic number, because the mean of its divisors is an integer number (57670680).

Almost surely, 2^221070917 is an apocalyptic number.

It is an amenable number.

221070917 is a deficient number, since it is larger than the sum of its proper divisors (9611803).

221070917 is an equidigital number, since it uses as much as digits as its factorization.

221070917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9611802.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 221070917 is about 14868.4537528285. The cubic root of 221070917 is about 604.6590223959.

The spelling of 221070917 in words is "two hundred twenty-one million, seventy thousand, nine hundred seventeen".