21222002221211 has 32 divisors (see below), whose sum is σ = 24026998533120. Its totient is φ = 18576481996800.

The previous prime is 21222002221171. The next prime is 21222002221261. The reversal of 21222002221211 is 11212220022212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222002221211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222002221261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23509241 + ... + 24395253.

It is an arithmetic number, because the mean of its divisors is an integer number (750843704160).

Almost surely, 2^{21222002221211} is an apocalyptic number.

21222002221211 is a deficient number, since it is larger than the sum of its proper divisors (2804996311909).

21222002221211 is a wasteful number, since it uses less digits than its factorization.

21222002221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886787.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222002221211 its reverse (11212220022212), we get a palindrome (32434222243423).

It can be divided in two parts, 212220022212 and 11, that multiplied together give a palindrome (2334420244332).

The spelling of 21222002221211 in words is "twenty-one trillion, two hundred twenty-two billion, two million, two hundred twenty-one thousand, two hundred eleven".