221200022100 has 72 divisors (see below), whose sum is σ = 643221678400. Its totient is φ = 58690241280.

The previous prime is 221200022083. The next prime is 221200022137. The reversal of 221200022100 is 1220002122.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 1792897 + ... + 1912296.

Almost surely, 2^221200022100 is an apocalyptic number.

221200022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200022100 is an abundant number, since it is smaller than the sum of its proper divisors (422021656300).

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

221200022100 is a wasteful number, since it uses less digits than its factorization.

221200022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705409 (or 3705402 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 221200022100 its reverse (1220002122), we get a palindrome (222420024222).

The spelling of 221200022100 in words is "two hundred twenty-one billion, two hundred million, twenty-two thousand, one hundred".