21050304400 has 120 divisors (see below), whose sum is σ = 53750559744. Its totient is φ = 7894886400.

The previous prime is 21050304391. The next prime is 21050304427. The reversal of 21050304400 is 440305012.

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, 1837089 + ... + 1848511.

Almost surely, 2^21050304400 is an apocalyptic number.

21050304400 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 21050304400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26875279872).

21050304400 is an abundant number, since it is smaller than the sum of its proper divisors (32700255344).

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

21050304400 is a wasteful number, since it uses less digits than its factorization.

21050304400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11729 (or 11718 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21050304400 its reverse (440305012), we get a palindrome (21490609412).

The spelling of 21050304400 in words is "twenty-one billion, fifty million, three hundred four thousand, four hundred".