21222102121211 has 16 divisors (see below), whose sum is σ = 21325470566400. Its totient is φ = 21118969234368.

The previous prime is 21222102121169. The next prime is 21222102121261. The reversal of 21222102121211 is 11212120122212.

It is a cyclic number.

It is not a de Polignac number, because 21222102121211 - 2³⁴ = 21204922252027 is a prime.

It is a super-2 number, since 2×21222102121211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222102121261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1514883575 + ... + 1514897583.

It is an arithmetic number, because the mean of its divisors is an integer number (1332841910400).

Almost surely, 2^{21222102121211} is an apocalyptic number.

21222102121211 is a deficient number, since it is larger than the sum of its proper divisors (103368445189).

21222102121211 is a wasteful number, since it uses less digits than its factorization.

21222102121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21898.

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

Adding to 21222102121211 its reverse (11212120122212), we get a palindrome (32434222243423).

The spelling of 21222102121211 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred two million, one hundred twenty-one thousand, two hundred eleven".