21121002200 has 24 divisors (see below), whose sum is σ = 49106330580. Its totient is φ = 8448400800.

The previous prime is 21121002187. The next prime is 21121002211. The reversal of 21121002200 is 220012112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52802306 + ... + 52802705.

Almost surely, 2^21121002200 is an apocalyptic number.

21121002200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121002200 is an abundant number, since it is smaller than the sum of its proper divisors (27985328380).

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

21121002200 is a wasteful number, since it uses less digits than its factorization.

21121002200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105605027 (or 105605018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21121002200 its reverse (220012112), we get a palindrome (21341014312).

The spelling of 21121002200 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred".