21112222222021 has 4 divisors (see below), whose sum is σ = 24128253968032. Its totient is φ = 18096190476012.

The previous prime is 21112222222019. The next prime is 21112222222057. The reversal of 21112222222021 is 12022222221112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21112222222021 - 2¹ = 21112222222019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112222221983 and 21112222222001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112222222921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1508015872995 + ... + 1508015873008.

It is an arithmetic number, because the mean of its divisors is an integer number (6032063492008).

Almost surely, 2^{21112222222021} is an apocalyptic number.

It is an amenable number.

21112222222021 is a deficient number, since it is larger than the sum of its proper divisors (3016031746011).

21112222222021 is an equidigital number, since it uses as much as digits as its factorization.

21112222222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016031746010.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21112222222021 its reverse (12022222221112), we get a palindrome (33134444443133).

Subtracting from 21112222222021 its reverse (12022222221112), we obtain a palindrome (9090000000909).

The spelling of 21112222222021 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-one".