21300260 has 12 divisors (see below), whose sum is σ = 44730588. Its totient is φ = 8520096.

The previous prime is 21300233. The next prime is 21300287. The reversal of 21300260 is 6200312.

It is an interprime number because it is at equal distance from previous prime (21300233) and next prime (21300287).

It can be written as a sum of positive squares in 2 ways, for example, as 12348196 + 8952064 = 3514^2 + 2992^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532487 + ... + 532526.

It is an arithmetic number, because the mean of its divisors is an integer number (3727549).

Almost surely, 2^21300260 is an apocalyptic number.

21300260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300260 is an abundant number, since it is smaller than the sum of its proper divisors (23430328).

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

21300260 is a wasteful number, since it uses less digits than its factorization.

21300260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065022 (or 1065020 counting only the distinct ones).

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

The square root of 21300260 is about 4615.2204714401. The cubic root of 21300260 is about 277.2011120575.

Adding to 21300260 its reverse (6200312), we get a palindrome (27500572).

The spelling of 21300260 in words is "twenty-one million, three hundred thousand, two hundred sixty".