221022202222100 has 72 divisors (see below), whose sum is σ = 479750732555640. Its totient is φ = 88384450682880.

The previous prime is 221022202222099. The next prime is 221022202222109. The reversal of 221022202222100 is 1222202220122.

It can be written as a sum of positive squares in 12 ways, for example, as 213949304524036 + 7072897698064 = 14627006^2 + 2659492^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022202222109) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 8987187404 + ... + 8987211996.

Almost surely, 2^{221022202222100} is an apocalyptic number.

221022202222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221022202222100 is an abundant number, since it is smaller than the sum of its proper divisors (258728530333540).

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

221022202222100 is a wasteful number, since it uses less digits than its factorization.

221022202222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45789 (or 45782 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 221022202222100 its reverse (1222202220122), we get a palindrome (222244404442222).

The spelling of 221022202222100 in words is "two hundred twenty-one trillion, twenty-two billion, two hundred two million, two hundred twenty-two thousand, one hundred".