221770617 has 16 divisors (see below), whose sum is σ = 300061440. Its totient is φ = 145671552.

The previous prime is 221770613. The next prime is 221770643. The reversal of 221770617 is 716077122.

It is a happy number.

It is not a de Polignac number, because 221770617 - 2² = 221770613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221770613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201613 + ... + 202709.

It is an arithmetic number, because the mean of its divisors is an integer number (18753840).

Almost surely, 2^221770617 is an apocalyptic number.

It is an amenable number.

221770617 is a deficient number, since it is larger than the sum of its proper divisors (78290823).

221770617 is a wasteful number, since it uses less digits than its factorization.

221770617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032.

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 221770617 is about 14891.9648468562. The cubic root of 221770617 is about 605.2962754410.

The spelling of 221770617 in words is "two hundred twenty-one million, seven hundred seventy thousand, six hundred seventeen".