21430200 has 192 divisors, whose sum is σ = 77137920. Its totient is φ = 4864000.

The previous prime is 21430193. The next prime is 21430229. The reversal of 21430200 is 203412.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112105 + ... + 112295.

It is an arithmetic number, because the mean of its divisors is an integer number (401760).

Almost surely, 2^21430200 is an apocalyptic number.

21430200 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 21430200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38568960).

21430200 is an abundant number, since it is smaller than the sum of its proper divisors (55707720).

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

21430200 is a wasteful number, since it uses less digits than its factorization.

21430200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21430200 is about 4629.2764013396. The cubic root of 21430200 is about 277.7636484665.

Adding to 21430200 its reverse (203412), we get a palindrome (21633612).

The spelling of 21430200 in words is "twenty-one million, four hundred thirty thousand, two hundred".