21222110220100 has 36 divisors (see below), whose sum is σ = 46474474423300. Its totient is φ = 8410964780160.

The previous prime is 21222110220079. The next prime is 21222110220163. The reversal of 21222110220100 is 102201122212.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3484068676 + 21218626151424 = 59026^2 + 4606368^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 973480395 + ... + 973502194.

Almost surely, 2^{21222110220100} is an apocalyptic number.

21222110220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222110220100 is an abundant number, since it is smaller than the sum of its proper divisors (25252364203200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222110220100 is a wasteful number, since it uses less digits than its factorization.

21222110220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946982712 (or 1946982705 counting only the distinct ones).

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

Adding to 21222110220100 its reverse (102201122212), we get a palindrome (21324311342312).

The spelling of 21222110220100 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, two hundred twenty thousand, one hundred".