12221009999 has 16 divisors (see below), whose sum is σ = 13898373120. Its totient is φ = 10645140000.

The previous prime is 12221009981. The next prime is 12221010013. The reversal of 12221009999 is 99990012221.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12221009999 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 (12221009939) 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, 142979 + ... + 211860.

It is an arithmetic number, because the mean of its divisors is an integer number (868648320).

Almost surely, 2^12221009999 is an apocalyptic number.

12221009999 is a deficient number, since it is larger than the sum of its proper divisors (1677363121).

12221009999 is a wasteful number, since it uses less digits than its factorization.

12221009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354982.

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 12221009999 in words is "twelve billion, two hundred twenty-one million, nine thousand, nine hundred ninety-nine".