21211110012109 has 8 divisors (see below), whose sum is σ = 21215604926880. Its totient is φ = 21206615469936.

The previous prime is 21211110012107. The next prime is 21211110012137. The reversal of 21211110012109 is 90121001111212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21211110012109 - 2¹ = 21211110012107 is a prime.

It is a super-2 number, since 2×21211110012109² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211110012109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211110012107) 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 7 ways as a sum of consecutive naturals, for example, 133455642 + ... + 133614484.

It is an arithmetic number, because the mean of its divisors is an integer number (2651950615860).

Almost surely, 2^{21211110012109} is an apocalyptic number.

It is an amenable number.

21211110012109 is a deficient number, since it is larger than the sum of its proper divisors (4494914771).

21211110012109 is a wasteful number, since it uses less digits than its factorization.

21211110012109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186299.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 21211110012109 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, twelve thousand, one hundred nine".