21221211222211 has 64 divisors (see below), whose sum is σ = 30172959129600. Its totient is φ = 14364174735360.

The previous prime is 21221211222209. The next prime is 21221211222223. The reversal of 21221211222211 is 11222211212212.

It is a cyclic number.

It is not a de Polignac number, because 21221211222211 - 2¹ = 21221211222209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221211226211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 131239390 + ... + 131400988.

It is an arithmetic number, because the mean of its divisors is an integer number (471452486400).

Almost surely, 2^{21221211222211} is an apocalyptic number.

21221211222211 is a deficient number, since it is larger than the sum of its proper divisors (8951747907389).

21221211222211 is a wasteful number, since it uses less digits than its factorization.

21221211222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169364.

The product of its digits is 256, while the sum is 22.

Adding to 21221211222211 its reverse (11222211212212), we get a palindrome (32443422434423).

Subtracting from 21221211222211 its reverse (11222211212212), we obtain a palindrome (9999000009999).

The spelling of 21221211222211 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, two hundred eleven".