221112021210100 has 72 divisors (see below), whose sum is σ = 486198075697880. Its totient is φ = 87273263185920.

The previous prime is 221112021210083. The next prime is 221112021210151. The reversal of 221112021210100 is 1012120211122.

It can be written as a sum of positive squares in 12 ways, for example, as 46443761581156 + 174668259628944 = 6814966^2 + 13216212^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30551655 + ... + 37089454.

Almost surely, 2^{221112021210100} is an apocalyptic number.

221112021210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221112021210100 is an abundant number, since it is smaller than the sum of its proper divisors (265086054487780).

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

221112021210100 is a wasteful number, since it uses less digits than its factorization.

221112021210100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67641557 (or 67641550 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221112021210100 its reverse (1012120211122), we get a palindrome (222124141421222).

The spelling of 221112021210100 in words is "two hundred twenty-one trillion, one hundred twelve billion, twenty-one million, two hundred ten thousand, one hundred".