21041220112000 has 256 divisors, whose sum is σ = 57634620975360. Its totient is φ = 7575590400000.

The previous prime is 21041220111973. The next prime is 21041220112007. The reversal of 21041220112000 is 21102214012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21041220112007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17184157 + ... + 18367843.

It is an arithmetic number, because the mean of its divisors is an integer number (225135238185).

Almost surely, 2^{21041220112000} is an apocalyptic number.

21041220112000 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 21041220112000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28817310487680).

21041220112000 is an abundant number, since it is smaller than the sum of its proper divisors (36593400863360).

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

21041220112000 is a wasteful number, since it uses less digits than its factorization.

21041220112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183828 (or 1183806 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21041220112000 its reverse (21102214012), we get a palindrome (21062322326012).

The spelling of 21041220112000 in words is "twenty-one trillion, forty-one billion, two hundred twenty million, one hundred twelve thousand".