21300387 has 16 divisors (see below), whose sum is σ = 30168960. Its totient is φ = 13329792.

The previous prime is 21300359. The next prime is 21300401. The reversal of 21300387 is 78300312.

It is not a de Polignac number, because 21300387 - 2¹¹ = 21298339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21300187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4788 + ... + 8094.

It is an arithmetic number, because the mean of its divisors is an integer number (1885560).

Almost surely, 2^21300387 is an apocalyptic number.

21300387 is a deficient number, since it is larger than the sum of its proper divisors (8868573).

21300387 is a wasteful number, since it uses less digits than its factorization.

21300387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21300387 is about 4615.2342302423. The cubic root of 21300387 is about 277.2016629815.

Adding to 21300387 its reverse (78300312), we get a palindrome (99600699).

The spelling of 21300387 in words is "twenty-one million, three hundred thousand, three hundred eighty-seven".