21334400 has 96 divisors (see below), whose sum is σ = 54070200. Its totient is φ = 8314880.

The previous prime is 21334387. The next prime is 21334427. The reversal of 21334400 is 443312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188744 + ... + 188856.

Almost surely, 2^21334400 is an apocalyptic number.

21334400 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 21334400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27035100).

21334400 is an abundant number, since it is smaller than the sum of its proper divisors (32735800).

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

21334400 is a wasteful number, since it uses less digits than its factorization.

21334400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21334400 is about 4618.9176221275. The cubic root of 21334400 is about 277.3491320717.

Adding to 21334400 its reverse (443312), we get a palindrome (21777712).

The spelling of 21334400 in words is "twenty-one million, three hundred thirty-four thousand, four hundred".