221212100010100 has 18 divisors (see below), whose sum is σ = 480030257022134. Its totient is φ = 88484840004000.

The previous prime is 221212100010079. The next prime is 221212100010113. The reversal of 221212100010100 is 1010001212122.

It can be written as a sum of positive squares in 3 ways, for example, as 6702858864144 + 214509241145956 = 2588988^2 + 14646134^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106060499951 + ... + 1106060500150.

Almost surely, 2^{221212100010100} is an apocalyptic number.

221212100010100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212100010100 is an abundant number, since it is smaller than the sum of its proper divisors (258818157012034).

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

221212100010100 is a wasteful number, since it uses less digits than its factorization.

221212100010100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212121000115 (or 2212121000108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221212100010100 its reverse (1010001212122), we get a palindrome (222222101222222).

The spelling of 221212100010100 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred million, ten thousand, one hundred".