21212022112211 has 4 divisors (see below), whose sum is σ = 24242310985392. Its totient is φ = 18181733239032.

The previous prime is 21212022112133. The next prime is 21212022112349. The reversal of 21212022112211 is 11221122021212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212022112211 - 2¹⁴ = 21212022095827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212022112111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515144436580 + ... + 1515144436593.

It is an arithmetic number, because the mean of its divisors is an integer number (6060577746348).

Almost surely, 2^{21212022112211} is an apocalyptic number.

21212022112211 is a deficient number, since it is larger than the sum of its proper divisors (3030288873181).

21212022112211 is an equidigital number, since it uses as much as digits as its factorization.

21212022112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030288873180.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21212022112211 its reverse (11221122021212), we get a palindrome (32433144133423).

Subtracting from 21212022112211 its reverse (11221122021212), we obtain a palindrome (9990900090999).

The spelling of 21212022112211 in words is "twenty-one trillion, two hundred twelve billion, twenty-two million, one hundred twelve thousand, two hundred eleven".