221221202200 has 24 divisors (see below), whose sum is σ = 514339295580. Its totient is φ = 88488480800.

The previous prime is 221221202149. The next prime is 221221202227. The reversal of 221221202200 is 2202122122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 553052806 + ... + 553053205.

Almost surely, 2^221221202200 is an apocalyptic number.

221221202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221202200 is an abundant number, since it is smaller than the sum of its proper divisors (293118093380).

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

221221202200 is a wasteful number, since it uses less digits than its factorization.

221221202200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106106027 (or 1106106018 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 221221202200 its reverse (2202122122), we get a palindrome (223423324322).

The spelling of 221221202200 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, two hundred".