221220122222100 has 36 divisors (see below), whose sum is σ = 640063553630144. Its totient is φ = 58992032592480.

The previous prime is 221220122222093. The next prime is 221220122222159. The reversal of 221220122222100 is 1222221022122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368700203404 + ... + 368700204003.

Almost surely, 2^{221220122222100} is an apocalyptic number.

221220122222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220122222100 is an abundant number, since it is smaller than the sum of its proper divisors (418843431408044).

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

221220122222100 is a wasteful number, since it uses less digits than its factorization.

221220122222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737400407424 (or 737400407417 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221220122222100 its reverse (1222221022122), we get a palindrome (222442343244222).

The spelling of 221220122222100 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred".