21222211221211 has 64 divisors (see below), whose sum is σ = 28611811952640. Its totient is φ = 15201755688960.

The previous prime is 21222211221191. The next prime is 21222211221223. The reversal of 21222211221211 is 11212211222212.

It is a cyclic number.

It is not a de Polignac number, because 21222211221211 - 2³⁵ = 21187851482843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222211221511) 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, 565349035 + ... + 565386571.

It is an arithmetic number, because the mean of its divisors is an integer number (447059561760).

Almost surely, 2^{21222211221211} is an apocalyptic number.

21222211221211 is a deficient number, since it is larger than the sum of its proper divisors (7389600731429).

21222211221211 is a wasteful number, since it uses less digits than its factorization.

21222211221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39884.

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

Adding to 21222211221211 its reverse (11212211222212), we get a palindrome (32434422443423).

The spelling of 21222211221211 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".