21001220022200 has 48 divisors (see below), whose sum is σ = 53266730789160. Its totient is φ = 7636807280000.

The previous prime is 21001220022187. The next prime is 21001220022221. The reversal of 21001220022200 is 222002210012.

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, 4773002351 + ... + 4773006750.

Almost surely, 2^{21001220022200} is an apocalyptic number.

21001220022200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001220022200 is an abundant number, since it is smaller than the sum of its proper divisors (32265510766960).

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

21001220022200 is a wasteful number, since it uses less digits than its factorization.

21001220022200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546009128 (or 9546009119 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21001220022200 its reverse (222002210012), we get a palindrome (21223222232212).

The spelling of 21001220022200 in words is "twenty-one trillion, one billion, two hundred twenty million, twenty-two thousand, two hundred".