21022121111109 has 8 divisors (see below), whose sum is σ = 29678288627520. Its totient is φ = 13190350501056.

The previous prime is 21022121111071. The next prime is 21022121111137. The reversal of 21022121111109 is 90111112122012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21022121111109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022121111179) 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, 206099226529 + ... + 206099226630.

It is an arithmetic number, because the mean of its divisors is an integer number (3709786078440).

Almost surely, 2^{21022121111109} is an apocalyptic number.

It is an amenable number.

21022121111109 is a deficient number, since it is larger than the sum of its proper divisors (8656167516411).

21022121111109 is a wasteful number, since it uses less digits than its factorization.

21022121111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412198453179.

The product of its (nonzero) digits is 144, while the sum is 24.

The spelling of 21022121111109 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, one hundred nine".