21222211112 has 8 divisors (see below), whose sum is σ = 39791645850. Its totient is φ = 10611105552.

The previous prime is 21222211111. The next prime is 21222211151. The reversal of 21222211112 is 21111222212.

It can be written as a sum of positive squares in only one way, i.e., 12277969636 + 8944241476 = 110806^2 + 94574^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21222211111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326388187 + ... + 1326388202.

Almost surely, 2^21222211112 is an apocalyptic number.

It is an amenable number.

21222211112 is a deficient number, since it is larger than the sum of its proper divisors (18569434738).

21222211112 is a wasteful number, since it uses less digits than its factorization.

21222211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652776395 (or 2652776391 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

Adding to 21222211112 its reverse (21111222212), we get a palindrome (42333433324).

The spelling of 21222211112 in words is "twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, one hundred twelve".