20211222120211 has 4 divisors (see below), whose sum is σ = 20224022135800. Its totient is φ = 20198422104624.

The previous prime is 20211222120181. The next prime is 20211222120253. The reversal of 20211222120211 is 11202122211202.

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 20211222120211 - 2¹⁵ = 20211222087443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211222120511) 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, 6400005426 + ... + 6400008583.

It is an arithmetic number, because the mean of its divisors is an integer number (5056005533950).

Almost surely, 2^{20211222120211} is an apocalyptic number.

20211222120211 is a deficient number, since it is larger than the sum of its proper divisors (12800015589).

20211222120211 is a wasteful number, since it uses less digits than its factorization.

20211222120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12800015588.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20211222120211 its reverse (11202122211202), we get a palindrome (31413344331413).

Subtracting from 20211222120211 its reverse (11202122211202), we obtain a palindrome (9009099909009).

The spelling of 20211222120211 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty thousand, two hundred eleven".