21441400 has 48 divisors (see below), whose sum is σ = 50934240. Its totient is φ = 8390400.

The previous prime is 21441383. The next prime is 21441421. The reversal of 21441400 is 414412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8260 + ... + 10540.

It is an arithmetic number, because the mean of its divisors is an integer number (1061130).

Almost surely, 2^21441400 is an apocalyptic number.

21441400 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 21441400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25467120).

21441400 is an abundant number, since it is smaller than the sum of its proper divisors (29492840).

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

21441400 is a wasteful number, since it uses less digits than its factorization.

21441400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2335 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21441400 is about 4630.4859356227. The cubic root of 21441400 is about 277.8120289617.

Adding to 21441400 its reverse (414412), we get a palindrome (21855812).

It can be divided in two parts, 214 and 41400, that added together give a palindrome (41614).

The spelling of 21441400 in words is "twenty-one million, four hundred forty-one thousand, four hundred".