21211112200 has 48 divisors (see below), whose sum is σ = 50518680660. Its totient is φ = 8277504000.

The previous prime is 21211112191. The next prime is 21211112201. The reversal of 21211112200 is 221111212.

It can be written as a sum of positive squares in 6 ways, for example, as 5215439524 + 15995672676 = 72218^2 + 126474^2 .

It is a super-2 number, since 2×21211112200² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21211112201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1285161 + ... + 1301560.

Almost surely, 2^21211112200 is an apocalyptic number.

21211112200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211112200 is an abundant number, since it is smaller than the sum of its proper divisors (29307568460).

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

21211112200 is a wasteful number, since it uses less digits than its factorization.

21211112200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586778 (or 2586769 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211112200 its reverse (221111212), we get a palindrome (21432223412).

The spelling of 21211112200 in words is "twenty-one billion, two hundred eleven million, one hundred twelve thousand, two hundred".