21052300 has 18 divisors (see below), whose sum is σ = 45683708. Its totient is φ = 8420880.

The previous prime is 21052279. The next prime is 21052301. The reversal of 21052300 is 325012.

It is not an unprimeable number, because it can be changed into a prime (21052301) 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 5 ways as a sum of consecutive naturals, for example, 105162 + ... + 105361.

Almost surely, 2^21052300 is an apocalyptic number.

21052300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21052300 is an abundant number, since it is smaller than the sum of its proper divisors (24631408).

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

21052300 is a wasteful number, since it uses less digits than its factorization.

21052300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210537 (or 210530 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 21052300 is about 4588.2785442909. The cubic root of 21052300 is about 276.1212622648.

Adding to 21052300 its reverse (325012), we get a palindrome (21377312).

The spelling of 21052300 in words is "twenty-one million, fifty-two thousand, three hundred".