21011331223200 has 144 divisors (see below), whose sum is σ = 68439754262880. Its totient is φ = 5599099806720.

The previous prime is 21011331223199. The next prime is 21011331223231. The reversal of 21011331223200 is 232213311012.

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, 366367 + ... + 6492833.

It is an arithmetic number, because the mean of its divisors is an integer number (475276071270).

Almost surely, 2^{21011331223200} is an apocalyptic number.

21011331223200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011331223200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34219877131440).

21011331223200 is an abundant number, since it is smaller than the sum of its proper divisors (47428423039680).

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

21011331223200 is a wasteful number, since it uses less digits than its factorization.

21011331223200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127919 (or 6127906 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21011331223200 its reverse (232213311012), we get a palindrome (21243544534212).

The spelling of 21011331223200 in words is "twenty-one trillion, eleven billion, three hundred thirty-one million, two hundred twenty-three thousand, two hundred".