21214222112 has 12 divisors (see below), whose sum is σ = 41765499846. Its totient is φ = 10607111040.

The previous prime is 21214222039. The next prime is 21214222193. The reversal of 21214222112 is 21122241212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19331009296 + 1883212816 = 139036^2 + 43396^2 .

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

It is an unprimeable number.

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, 331472189 + ... + 331472252.

Almost surely, 2^21214222112 is an apocalyptic number.

It is an amenable number.

21214222112 is a deficient number, since it is larger than the sum of its proper divisors (20551277734).

21214222112 is an equidigital number, since it uses as much as digits as its factorization.

21214222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662944451 (or 662944443 counting only the distinct ones).

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

Adding to 21214222112 its reverse (21122241212), we get a palindrome (42336463324).

The spelling of 21214222112 in words is "twenty-one billion, two hundred fourteen million, two hundred twenty-two thousand, one hundred twelve".