21001200200 has 24 divisors (see below), whose sum is σ = 48827790930. Its totient is φ = 8400480000.

The previous prime is 21001200191. The next prime is 21001200217. The reversal of 21001200200 is 200210012.

It can be written as a sum of positive squares in 3 ways, for example, as 18785991844 + 2215208356 = 137062^2 + 47066^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52502801 + ... + 52503200.

Almost surely, 2^21001200200 is an apocalyptic number.

21001200200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001200200 is an abundant number, since it is smaller than the sum of its proper divisors (27826590730).

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

21001200200 is a wasteful number, since it uses less digits than its factorization.

21001200200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105006017 (or 105006008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21001200200 its reverse (200210012), we get a palindrome (21201410212).

The spelling of 21001200200 in words is "twenty-one billion, one million, two hundred thousand, two hundred".