21404340041320 has 256 divisors, whose sum is σ = 52907806022400. Its totient is φ = 7757165445120.

The previous prime is 21404340041297. The next prime is 21404340041351. The reversal of 21404340041320 is 2314004340412.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18278684335 + ... + 18278685505.

It is an arithmetic number, because the mean of its divisors is an integer number (206671117275).

Almost surely, 2^{21404340041320} is an apocalyptic number.

21404340041320 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 21404340041320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26453903011200).

21404340041320 is an abundant number, since it is smaller than the sum of its proper divisors (31503465981080).

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

21404340041320 is a wasteful number, since it uses less digits than its factorization.

21404340041320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188 (or 3184 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21404340041320 its reverse (2314004340412), we get a palindrome (23718344381732).

The spelling of 21404340041320 in words is "twenty-one trillion, four hundred four billion, three hundred forty million, forty-one thousand, three hundred twenty".