21004110400 has 168 divisors, whose sum is σ = 63610581440. Its totient is φ = 6647408640.

The previous prime is 21004110397. The next prime is 21004110431. The reversal of 21004110400 is 401140012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73471 + ... + 217729.

Almost surely, 2^21004110400 is an apocalyptic number.

21004110400 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 21004110400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31805290720).

21004110400 is an abundant number, since it is smaller than the sum of its proper divisors (42606471040).

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

21004110400 is a wasteful number, since it uses less digits than its factorization.

21004110400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144301 (or 144286 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21004110400 its reverse (401140012), we get a palindrome (21405250412).

The spelling of 21004110400 in words is "twenty-one billion, four million, one hundred ten thousand, four hundred".