21211211111222 has 48 divisors (see below), whose sum is σ = 35521081670256. Its totient is φ = 9490357958400.

The previous prime is 21211211111197. The next prime is 21211211111231. The reversal of 21211211111222 is 22211111211212.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21211211111194 and 21211211111203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20923538 + ... + 21913850.

It is an arithmetic number, because the mean of its divisors is an integer number (740022534797).

Almost surely, 2^{21211211111222} is an apocalyptic number.

21211211111222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211211111222 is a deficient number, since it is larger than the sum of its proper divisors (14309870559034).

21211211111222 is a wasteful number, since it uses less digits than its factorization.

21211211111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991725 (or 991714 counting only the distinct ones).

The product of its digits is 64, while the sum is 20.

Adding to 21211211111222 its reverse (22211111211212), we get a palindrome (43422322322434).

The spelling of 21211211111222 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty-two".