21214400 has 42 divisors (see below), whose sum is σ = 52204620. Its totient is φ = 8485120.

The previous prime is 21214381. The next prime is 21214429. The reversal of 21214400 is 441212.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5030 + ... + 8229.

Almost surely, 2^21214400 is an apocalyptic number.

21214400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214400 is an abundant number, since it is smaller than the sum of its proper divisors (30990220).

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

21214400 is a wasteful number, since it uses less digits than its factorization.

21214400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13281 (or 13266 counting only the distinct ones).

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

The square root of 21214400 is about 4605.9092479119. The cubic root of 21214400 is about 276.8281504332.

Adding to 21214400 its reverse (441212), we get a palindrome (21655612).

The spelling of 21214400 in words is "twenty-one million, two hundred fourteen thousand, four hundred".