221011999 has 8 divisors (see below), whose sum is σ = 238224672. Its totient is φ = 203829600.

The previous prime is 221011993. The next prime is 221012039. The reversal of 221011999 is 999110122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221011999 - 2¹⁷ = 220880927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011993) 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 7 ways as a sum of consecutive naturals, for example, 8949 + ... + 22849.

It is an arithmetic number, because the mean of its divisors is an integer number (29778084).

Almost surely, 2^221011999 is an apocalyptic number.

221011999 is a deficient number, since it is larger than the sum of its proper divisors (17212673).

221011999 is a wasteful number, since it uses less digits than its factorization.

221011999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15137.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 221011999 is about 14866.4723118835. The cubic root of 221011999 is about 604.6053013757.

The spelling of 221011999 in words is "two hundred twenty-one million, eleven thousand, nine hundred ninety-nine".