21404612007012 has 96 divisors (see below), whose sum is σ = 54322629782400. Its totient is φ = 6520639721472.

The previous prime is 21404612006989. The next prime is 21404612007013. The reversal of 21404612007012 is 21070021640412.

It is not an unprimeable number, because it can be changed into a prime (21404612007013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4720948 + ... + 8068244.

It is an arithmetic number, because the mean of its divisors is an integer number (565860726900).

Almost surely, 2^{21404612007012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404612007012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27161314891200).

21404612007012 is an abundant number, since it is smaller than the sum of its proper divisors (32918017775388).

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

21404612007012 is a wasteful number, since it uses less digits than its factorization.

21404612007012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3347725 (or 3347723 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

Adding to 21404612007012 its reverse (21070021640412), we get a palindrome (42474633647424).

The spelling of 21404612007012 in words is "twenty-one trillion, four hundred four billion, six hundred twelve million, seven thousand, twelve".