21104604323840 has 224 divisors, whose sum is σ = 50977292471424. Its totient is φ = 8387096739840.

The previous prime is 21104604323827. The next prime is 21104604323851. The reversal of 21104604323840 is 4832340640112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21104604323794 and 21104604323803.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5851011317 + ... + 5851014923.

Almost surely, 2^{21104604323840} is an apocalyptic number.

21104604323840 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 21104604323840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25488646235712).

21104604323840 is an abundant number, since it is smaller than the sum of its proper divisors (29872688147584).

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

21104604323840 is an equidigital number, since it uses as much as digits as its factorization.

21104604323840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526 (or 4502 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

Adding to 21104604323840 its reverse (4832340640112), we get a palindrome (25936944963952).

The spelling of 21104604323840 in words is "twenty-one trillion, one hundred four billion, six hundred four million, three hundred twenty-three thousand, eight hundred forty".