21211133200 has 30 divisors (see below), whose sum is σ = 50959748474. Its totient is φ = 8484453120.

The previous prime is 21211133179. The next prime is 21211133213. The reversal of 21211133200 is 233111212.

It can be written as a sum of positive squares in 3 ways, for example, as 234824976 + 20976308224 = 15324^2 + 144832^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 26513517 + ... + 26514316.

Almost surely, 2^21211133200 is an apocalyptic number.

21211133200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211133200 is an abundant number, since it is smaller than the sum of its proper divisors (29748615274).

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

21211133200 is a wasteful number, since it uses less digits than its factorization.

21211133200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53027851 (or 53027840 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21211133200 its reverse (233111212), we get a palindrome (21444244412).

The spelling of 21211133200 in words is "twenty-one billion, two hundred eleven million, one hundred thirty-three thousand, two hundred".