21143300 has 18 divisors (see below), whose sum is σ = 45881178. Its totient is φ = 8457280.

The previous prime is 21143293. The next prime is 21143327. The reversal of 21143300 is 334112.

It can be written as a sum of positive squares in 3 ways, for example, as 276676 + 20866624 = 526^2 + 4568^2 .

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, 105617 + ... + 105816.

Almost surely, 2^21143300 is an apocalyptic number.

21143300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21143300 is an abundant number, since it is smaller than the sum of its proper divisors (24737878).

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

21143300 is a wasteful number, since it uses less digits than its factorization.

21143300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211447 (or 211440 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21143300 is about 4598.1844243136. The cubic root of 21143300 is about 276.5185413764.

Adding to 21143300 its reverse (334112), we get a palindrome (21477412).

The spelling of 21143300 in words is "twenty-one million, one hundred forty-three thousand, three hundred".