21120403344210 has 192 divisors, whose sum is σ = 59364126132480. Its totient is φ = 5193773544960.

The previous prime is 21120403344163. The next prime is 21120403344211. The reversal of 21120403344210 is 1244330402112.

21120403344210 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 0 + 403 + 3 + 44 + 210 = 666.

It is not an unprimeable number, because it can be changed into a prime (21120403344211) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 40380465 + ... + 40900155.

It is an arithmetic number, because the mean of its divisors is an integer number (309188156940).

Almost surely, 2^{21120403344210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120403344210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29682063066240).

21120403344210 is an abundant number, since it is smaller than the sum of its proper divisors (38243722788270).

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

21120403344210 is a wasteful number, since it uses less digits than its factorization.

21120403344210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520433 (or 520430 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21120403344210 its reverse (1244330402112), we get a palindrome (22364733746322).

The spelling of 21120403344210 in words is "twenty-one trillion, one hundred twenty billion, four hundred three million, three hundred forty-four thousand, two hundred ten".