221109999 has 16 divisors (see below), whose sum is σ = 329096064. Its totient is φ = 130888800.

The previous prime is 221109947. The next prime is 221110003. The reversal of 221109999 is 999901122.

It is not a de Polignac number, because 221109999 - 2⁹ = 221109487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221109999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221108999) 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, 76492 + ... + 79329.

It is an arithmetic number, because the mean of its divisors is an integer number (20568504).

Almost surely, 2^221109999 is an apocalyptic number.

221109999 is a deficient number, since it is larger than the sum of its proper divisors (107986065).

221109999 is a wasteful number, since it uses less digits than its factorization.

221109999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155878.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 221109999 is about 14869.7679538048. The cubic root of 221109999 is about 604.6946518247.

The spelling of 221109999 in words is "two hundred twenty-one million, one hundred nine thousand, nine hundred ninety-nine".