221116649 has 16 divisors (see below), whose sum is σ = 247411584. Its totient is φ = 196291200.

The previous prime is 221116639. The next prime is 221116667. The reversal of 221116649 is 946611122.

It is a cyclic number.

It is not a de Polignac number, because 221116649 - 2¹⁶ = 221051113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221116639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34922 + ... + 40764.

It is an arithmetic number, because the mean of its divisors is an integer number (15463224).

Almost surely, 2^221116649 is an apocalyptic number.

It is an amenable number.

221116649 is a deficient number, since it is larger than the sum of its proper divisors (26294935).

221116649 is a wasteful number, since it uses less digits than its factorization.

221116649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5968.

The product of its digits is 5184, while the sum is 32.

The square root of 221116649 is about 14869.9915601859. The cubic root of 221116649 is about 604.7007139343.

The spelling of 221116649 in words is "two hundred twenty-one million, one hundred sixteen thousand, six hundred forty-nine".