21034200 has 96 divisors (see below), whose sum is σ = 71156160. Its totient is φ = 5097600.

The previous prime is 21034199. The next prime is 21034201. The reversal of 21034200 is 243012.

It is an interprime number because it is at equal distance from previous prime (21034199) and next prime (21034201).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034201) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5007 + ... + 8193.

It is an arithmetic number, because the mean of its divisors is an integer number (741210).

Almost surely, 2^21034200 is an apocalyptic number.

21034200 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 21034200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35578080).

21034200 is an abundant number, since it is smaller than the sum of its proper divisors (50121960).

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

21034200 is a wasteful number, since it uses less digits than its factorization.

21034200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217 (or 3208 counting only the distinct ones).

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

The square root of 21034200 is about 4586.3057028506. The cubic root of 21034200 is about 276.0421065774.

Adding to 21034200 its reverse (243012), we get a palindrome (21277212).

The spelling of 21034200 in words is "twenty-one million, thirty-four thousand, two hundred".