21011220100200 has 96 divisors (see below), whose sum is σ = 71056126179360. Its totient is φ = 5093629113600.

The previous prime is 21011220100151. The next prime is 21011220100301. The reversal of 21011220100200 is 200102211012.

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

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, 1591752499 + ... + 1591765698.

It is an arithmetic number, because the mean of its divisors is an integer number (740167981035).

Almost surely, 2^{21011220100200} is an apocalyptic number.

21011220100200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011220100200 is an abundant number, since it is smaller than the sum of its proper divisors (50044906079160).

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

21011220100200 is a wasteful number, since it uses less digits than its factorization.

21011220100200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3183518227 (or 3183518218 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21011220100200 its reverse (200102211012), we get a palindrome (21211322311212).

The spelling of 21011220100200 in words is "twenty-one trillion, eleven billion, two hundred twenty million, one hundred thousand, two hundred".