21221110222 has 32 divisors (see below), whose sum is σ = 36122234400. Its totient is φ = 9269157888.

The previous prime is 21221110193. The next prime is 21221110223. The reversal of 21221110222 is 22201112212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21221110196 and 21221110205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221110223) 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 in 15 ways as a sum of consecutive naturals, for example, 460654 + ... + 504622.

It is an arithmetic number, because the mean of its divisors is an integer number (1128819825).

Almost surely, 2^21221110222 is an apocalyptic number.

21221110222 is a deficient number, since it is larger than the sum of its proper divisors (14901124178).

21221110222 is a wasteful number, since it uses less digits than its factorization.

21221110222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44980.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221110222 its reverse (22201112212), we get a palindrome (43422222434).

The spelling of 21221110222 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, two hundred twenty-two".