22121612109 has 16 divisors (see below), whose sum is σ = 32778179200. Its totient is φ = 14745302208.

The previous prime is 22121612069. The next prime is 22121612111. The reversal of 22121612109 is 90121612122.

22121612109 is a `hidden beast` number, since 2 + 21 + 21 + 612 + 1 + 0 + 9 = 666.

It is not a de Polignac number, because 22121612109 - 2¹⁷ = 22121481037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121612189) 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, 106677 + ... + 235845.

It is an arithmetic number, because the mean of its divisors is an integer number (2048636200).

Almost surely, 2^22121612109 is an apocalyptic number.

It is an amenable number.

22121612109 is a deficient number, since it is larger than the sum of its proper divisors (10656567091).

22121612109 is a wasteful number, since it uses less digits than its factorization.

22121612109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135521 (or 135515 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 22121612109 in words is "twenty-two billion, one hundred twenty-one million, six hundred twelve thousand, one hundred nine".