21112220109 has 16 divisors (see below), whose sum is σ = 29276481344. Its totient is φ = 13522118400.

The previous prime is 21112220069. The next prime is 21112220113. The reversal of 21112220109 is 90102221112.

It is a de Polignac number, because none of the positive numbers 2^k-21112220109 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 (21112220209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1333612 + ... + 1349349.

It is an arithmetic number, because the mean of its divisors is an integer number (1829780084).

Almost surely, 2^21112220109 is an apocalyptic number.

It is an amenable number.

21112220109 is a deficient number, since it is larger than the sum of its proper divisors (8164261235).

21112220109 is a wasteful number, since it uses less digits than its factorization.

21112220109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683068.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21112220109 in words is "twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred nine".