21111202200 has 96 divisors (see below), whose sum is σ = 71394269760. Its totient is φ = 5117865600.

The previous prime is 21111202193. The next prime is 21111202219. The reversal of 21111202200 is 220211112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1592734 + ... + 1605933.

It is an arithmetic number, because the mean of its divisors is an integer number (743690310).

Almost surely, 2^21111202200 is an apocalyptic number.

21111202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111202200 is an abundant number, since it is smaller than the sum of its proper divisors (50283067560).

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

21111202200 is a wasteful number, since it uses less digits than its factorization.

21111202200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198697 (or 3198688 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21111202200 its reverse (220211112), we get a palindrome (21331413312).

The spelling of 21111202200 in words is "twenty-one billion, one hundred eleven million, two hundred two thousand, two hundred".