21313300 has 18 divisors (see below), whose sum is σ = 46250078. Its totient is φ = 8525280.

The previous prime is 21313297. The next prime is 21313301. The reversal of 21313300 is 331312.

It can be written as a sum of positive squares in 3 ways, for example, as 355216 + 20958084 = 596^2 + 4578^2 .

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313301) 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, 106467 + ... + 106666.

Almost surely, 2^21313300 is an apocalyptic number.

21313300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313300 is an abundant number, since it is smaller than the sum of its proper divisors (24936778).

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

21313300 is a wasteful number, since it uses less digits than its factorization.

21313300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213147 (or 213140 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21313300 is about 4616.6329721995. The cubic root of 21313300 is about 277.2576679417.

Adding to 21313300 its reverse (331312), we get a palindrome (21644612).

The spelling of 21313300 in words is "twenty-one million, three hundred thirteen thousand, three hundred".