21112101112021 has 8 divisors (see below), whose sum is σ = 21289390689600. Its totient is φ = 20935055905920.

The previous prime is 21112101111991. The next prime is 21112101112043. The reversal of 21112101112021 is 12021110121112.

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 21112101112021 - 2¹⁵ = 21112101079253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112101111986 and 21112101112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112101112321) 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, 60919356 + ... + 61264933.

It is an arithmetic number, because the mean of its divisors is an integer number (2661173836200).

Almost surely, 2^{21112101112021} is an apocalyptic number.

It is an amenable number.

21112101112021 is a deficient number, since it is larger than the sum of its proper divisors (177289577579).

21112101112021 is a wasteful number, since it uses less digits than its factorization.

21112101112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122185739.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21112101112021 its reverse (12021110121112), we get a palindrome (33133211233133).

Subtracting from 21112101112021 its reverse (12021110121112), we obtain a palindrome (9090990990909).

The spelling of 21112101112021 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, one hundred twelve thousand, twenty-one".