21112122200021 has 8 divisors (see below), whose sum is σ = 21715034964480. Its totient is φ = 20514297307392.

The previous prime is 21112122199951. The next prime is 21112122200027. The reversal of 21112122200021 is 12000222121112.

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 21112122200021 - 2³⁰ = 21111048458197 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 (21112122200027) 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, 1271959541 + ... + 1271976138.

It is an arithmetic number, because the mean of its divisors is an integer number (2714379370560).

Almost surely, 2^{21112122200021} is an apocalyptic number.

It is an amenable number.

21112122200021 is a deficient number, since it is larger than the sum of its proper divisors (602912764459).

21112122200021 is a wasteful number, since it uses less digits than its factorization.

21112122200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543935915.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21112122200021 its reverse (12000222121112), we get a palindrome (33112344321133).

The spelling of 21112122200021 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, two hundred thousand, twenty-one".