21034300 has 72 divisors (see below), whose sum is σ = 52774400. Its totient is φ = 7128000.

The previous prime is 21034297. The next prime is 21034301. The reversal of 21034300 is 343012.

21034300 = 221² + 222² + ... + 419².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105601 + ... + 105799.

Almost surely, 2^21034300 is an apocalyptic number.

21034300 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 21034300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26387200).

21034300 is an abundant number, since it is smaller than the sum of its proper divisors (31740100).

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

21034300 is a wasteful number, since it uses less digits than its factorization.

21034300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21034300 is about 4586.3166048584. The cubic root of 21034300 is about 276.0425440263.

Adding to 21034300 its reverse (343012), we get a palindrome (21377312).

The spelling of 21034300 in words is "twenty-one million, thirty-four thousand, three hundred".