21201111112200 has 96 divisors (see below), whose sum is σ = 65748055724160. Its totient is φ = 5651512531200.

The previous prime is 21201111112177. The next prime is 21201111112211. The reversal of 21201111112200 is 221111110212.

It is a happy number.

It is a super-2 number, since 2×21201111112200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21201111112200.

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, 5011999 + ... + 8217198.

It is an arithmetic number, because the mean of its divisors is an integer number (684875580460).

Almost surely, 2^{21201111112200} is an apocalyptic number.

21201111112200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201111112200 is an abundant number, since it is smaller than the sum of its proper divisors (44546944611960).

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

21201111112200 is a wasteful number, since it uses less digits than its factorization.

21201111112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13231887 (or 13231878 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21201111112200 its reverse (221111110212), we get a palindrome (21422222222412).

The spelling of 21201111112200 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, one hundred twelve thousand, two hundred".