21221001111200 has 144 divisors (see below), whose sum is σ = 56889661953600. Its totient is φ = 7665623040000.

The previous prime is 21221001111199. The next prime is 21221001111281. The reversal of 21221001111200 is 211110012212.

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, 6656225 + ... + 9313824.

It is an arithmetic number, because the mean of its divisors is an integer number (395067096900).

Almost surely, 2^{21221001111200} is an apocalyptic number.

21221001111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221001111200 is an abundant number, since it is smaller than the sum of its proper divisors (35668660842400).

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

21221001111200 is a wasteful number, since it uses less digits than its factorization.

21221001111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15970231 (or 15970218 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221001111200 its reverse (211110012212), we get a palindrome (21432111123412).

The spelling of 21221001111200 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred eleven thousand, two hundred".