21303887 has 8 divisors (see below), whose sum is σ = 23807952. Its totient is φ = 18894400.

The previous prime is 21303857. The next prime is 21303901. The reversal of 21303887 is 78830312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21303887 - 2⁸ = 21303631 is a prime.

It is a super-3 number, since 3×21303887³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303817) 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 7 ways as a sum of consecutive naturals, for example, 23168 + ... + 24069.

It is an arithmetic number, because the mean of its divisors is an integer number (2975994).

Almost surely, 2^21303887 is an apocalyptic number.

21303887 is a deficient number, since it is larger than the sum of its proper divisors (2504065).

21303887 is a wasteful number, since it uses less digits than its factorization.

21303887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47289.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 21303887 is about 4615.6133936889. The cubic root of 21303887 is about 277.2168450638.

The spelling of 21303887 in words is "twenty-one million, three hundred three thousand, eight hundred eighty-seven".