21001221000200 has 48 divisors (see below), whose sum is σ = 55803244375680. Its totient is φ = 7200418628160.

The previous prime is 21001221000143. The next prime is 21001221000217. The reversal of 21001221000200 is 200012210012.

It is a happy number.

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, 7500434672 + ... + 7500437471.

It is an arithmetic number, because the mean of its divisors is an integer number (1162567591160).

Almost surely, 2^{21001221000200} is an apocalyptic number.

21001221000200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001221000200 is an abundant number, since it is smaller than the sum of its proper divisors (34802023375480).

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

21001221000200 is a wasteful number, since it uses less digits than its factorization.

21001221000200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15000872166 (or 15000872157 counting only the distinct ones).

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

Adding to 21001221000200 its reverse (200012210012), we get a palindrome (21201233210212).

The spelling of 21001221000200 in words is "twenty-one trillion, one billion, two hundred twenty-one million, two hundred", and thus it is an aban number.