221221022200 has 48 divisors (see below), whose sum is σ = 515566611000. Its totient is φ = 88277185920.

The previous prime is 221221022189. The next prime is 221221022201. The reversal of 221221022200 is 2220122122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221022201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1236135 + ... + 1403734.

Almost surely, 2^221221022200 is an apocalyptic number.

221221022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221022200 is an abundant number, since it is smaller than the sum of its proper divisors (294345588800).

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

221221022200 is a wasteful number, since it uses less digits than its factorization.

221221022200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640304 (or 2640295 counting only the distinct ones).

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

Adding to 221221022200 its reverse (2220122122), we get a palindrome (223441144322).

The spelling of 221221022200 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred".