21230330400 has 216 divisors, whose sum is σ = 74969045424. Its totient is φ = 5653440000.

The previous prime is 21230330399. The next prime is 21230330413. The reversal of 21230330400 is 403303212.

21230330400 is a `hidden beast` number, since 2 + 1 + 230 + 3 + 30 + 400 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6528775 + ... + 6532025.

It is an arithmetic number, because the mean of its divisors is an integer number (347078914).

Almost surely, 2^21230330400 is an apocalyptic number.

21230330400 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 21230330400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37484522712).

21230330400 is an abundant number, since it is smaller than the sum of its proper divisors (53738715024).

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

21230330400 is a wasteful number, since it uses less digits than its factorization.

21230330400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184 (or 4168 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21230330400 its reverse (403303212), we get a palindrome (21633633612).

The spelling of 21230330400 in words is "twenty-one billion, two hundred thirty million, three hundred thirty thousand, four hundred".