21222102111211 has 4 divisors (see below), whose sum is σ = 21223876694800. Its totient is φ = 21220327527624.

The previous prime is 21222102111143. The next prime is 21222102111229. The reversal of 21222102111211 is 11211120122212.

It is a happy number.

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 21222102111211 - 2¹³ = 21222102103019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222102111611) 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, 887273856 + ... + 887297773.

It is an arithmetic number, because the mean of its divisors is an integer number (5305969173700).

Almost surely, 2^{21222102111211} is an apocalyptic number.

21222102111211 is a deficient number, since it is larger than the sum of its proper divisors (1774583589).

21222102111211 is a wasteful number, since it uses less digits than its factorization.

21222102111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774583588.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21222102111211 its reverse (11211120122212), we get a palindrome (32433222233423).

The spelling of 21222102111211 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred two million, one hundred eleven thousand, two hundred eleven".