221111009999 has 6 divisors (see below), whose sum is σ = 243039374760. Its totient is φ = 201010008980.

The previous prime is 221111009971. The next prime is 221111010079. The reversal of 221111009999 is 999900111122.

It is a de Polignac number, because none of the positive numbers 2^k-221111009999 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111009939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 913681739 + ... + 913681980.

It is an arithmetic number, because the mean of its divisors is an integer number (40506562460).

Almost surely, 2^221111009999 is an apocalyptic number.

221111009999 is a deficient number, since it is larger than the sum of its proper divisors (21928364761).

221111009999 is a wasteful number, since it uses less digits than its factorization.

221111009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827363741 (or 1827363730 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 221111009999 in words is "two hundred twenty-one billion, one hundred eleven million, nine thousand, nine hundred ninety-nine".