21011220000200 has 48 divisors (see below), whose sum is σ = 48859670052180. Its totient is φ = 8403011260160.

The previous prime is 21011220000187. The next prime is 21011220000317. The reversal of 21011220000200 is 200002211012.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2922547526116 + 18088672474084 = 1709546^2 + 4253078^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8088179 + ... + 10365378.

Almost surely, 2^{21011220000200} is an apocalyptic number.

21011220000200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011220000200 is an abundant number, since it is smaller than the sum of its proper divisors (27848450051980).

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

21011220000200 is a wasteful number, since it uses less digits than its factorization.

21011220000200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18459266 (or 18459257 counting only the distinct ones).

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

Adding to 21011220000200 its reverse (200002211012), we get a palindrome (21211222211212).

The spelling of 21011220000200 in words is "twenty-one trillion, eleven billion, two hundred twenty million, two hundred", and thus it is an aban number.