21210201200 has 30 divisors (see below), whose sum is σ = 50957509344. Its totient is φ = 8484080320.

The previous prime is 21210201179. The next prime is 21210201217. The reversal of 21210201200 is 210201212.

It is a happy number.

It is a congruent number.

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, 26512352 + ... + 26513151.

Almost surely, 2^21210201200 is an apocalyptic number.

21210201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210201200 is an abundant number, since it is smaller than the sum of its proper divisors (29747308144).

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

21210201200 is a wasteful number, since it uses less digits than its factorization.

21210201200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53025521 (or 53025510 counting only the distinct ones).

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

Adding to 21210201200 its reverse (210201212), we get a palindrome (21420402412).

The spelling of 21210201200 in words is "twenty-one billion, two hundred ten million, two hundred one thousand, two hundred".