21211211101109 has 8 divisors (see below), whose sum is σ = 21245070879360. Its totient is φ = 21177352098000.

The previous prime is 21211211101081. The next prime is 21211211101181. The reversal of 21211211101109 is 90110111211212.

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 21211211101109 - 2⁸ = 21211211100853 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 (21211211101189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82975712 + ... + 83230950.

It is an arithmetic number, because the mean of its divisors is an integer number (2655633859920).

Almost surely, 2^{21211211101109} is an apocalyptic number.

It is an amenable number.

21211211101109 is a deficient number, since it is larger than the sum of its proper divisors (33859778251).

21211211101109 is a wasteful number, since it uses less digits than its factorization.

21211211101109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387571.

The product of its (nonzero) digits is 72, while the sum is 23.

The spelling of 21211211101109 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, one hundred one thousand, one hundred nine".