21428341803904 has 256 divisors, whose sum is σ = 51044837437440. Its totient is φ = 8767446220800.

The previous prime is 21428341803901. The next prime is 21428341803929. The reversal of 21428341803904 is 40930814382412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21428341803901) 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, 716244754 + ... + 716274670.

It is an arithmetic number, because the mean of its divisors is an integer number (199393896240).

Almost surely, 2^{21428341803904} 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 21428341803904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25522418718720).

21428341803904 is an abundant number, since it is smaller than the sum of its proper divisors (29616495633536).

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

21428341803904 is a wasteful number, since it uses less digits than its factorization.

21428341803904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30317 (or 30305 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 21428341803904 in words is "twenty-one trillion, four hundred twenty-eight billion, three hundred forty-one million, eight hundred three thousand, nine hundred four".