221091099 has 16 divisors (see below), whose sum is σ = 305709600. Its totient is φ = 141958656.

The previous prime is 221091053. The next prime is 221091127. The reversal of 221091099 is 990190122.

It is not a de Polignac number, because 221091099 - 2⁸ = 221090843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221091599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34737 + ... + 40605.

It is an arithmetic number, because the mean of its divisors is an integer number (19106850).

Almost surely, 2^221091099 is an apocalyptic number.

221091099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

221091099 is a deficient number, since it is larger than the sum of its proper divisors (84618501).

221091099 is a wasteful number, since it uses less digits than its factorization.

221091099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6334.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 221091099 is about 14869.1324225726. The cubic root of 221091099 is about 604.6774220075.

The spelling of 221091099 in words is "two hundred twenty-one million, ninety-one thousand, ninety-nine".