21412400 has 60 divisors (see below), whose sum is σ = 51894000. Its totient is φ = 8490240.

The previous prime is 21412387. The next prime is 21412429. The reversal of 21412400 is 421412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79466 + ... + 79734.

It is an arithmetic number, because the mean of its divisors is an integer number (864900).

Almost surely, 2^21412400 is an apocalyptic number.

21412400 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 21412400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25947000).

21412400 is an abundant number, since it is smaller than the sum of its proper divisors (30481600).

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

21412400 is a wasteful number, since it uses less digits than its factorization.

21412400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 21412400 is about 4627.3534552701. The cubic root of 21412400 is about 277.6867233412.

Adding to 21412400 its reverse (421412), we get a palindrome (21833812).

It can be divided in two parts, 21412 and 400, that added together give a palindrome (21812).

The spelling of 21412400 in words is "twenty-one million, four hundred twelve thousand, four hundred".