21120211011120 has 320 divisors, whose sum is σ = 71621915904000. Its totient is φ = 5117009264640.

The previous prime is 21120211011073. The next prime is 21120211011127. The reversal of 21120211011120 is 2111011202112.

It is a happy number.

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 21120211011120.

It is not an unprimeable number, because it can be changed into a prime (21120211011127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 132610896 + ... + 132770064.

It is an arithmetic number, because the mean of its divisors is an integer number (223818487200).

Almost surely, 2^{21120211011120} is an apocalyptic number.

21120211011120 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 21120211011120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35810957952000).

21120211011120 is an abundant number, since it is smaller than the sum of its proper divisors (50501704892880).

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

21120211011120 is a wasteful number, since it uses less digits than its factorization.

21120211011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159868 (or 159862 counting only the distinct ones).

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

Adding to 21120211011120 its reverse (2111011202112), we get a palindrome (23231222213232).

The spelling of 21120211011120 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, eleven thousand, one hundred twenty".