21366675 has 72 divisors (see below), whose sum is σ = 42653520. Its totient is φ = 10137600.

The previous prime is 21366661. The next prime is 21366677. The reversal of 21366675 is 57666312.

It is not a de Polignac number, because 21366675 - 2⁷ = 21366547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366677) 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 71 ways as a sum of consecutive naturals, for example, 220227 + ... + 220323.

It is an arithmetic number, because the mean of its divisors is an integer number (592410).

Almost surely, 2^21366675 is an apocalyptic number.

21366675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21366675 is a deficient number, since it is larger than the sum of its proper divisors (21286845).

21366675 is a wasteful number, since it uses less digits than its factorization.

21366675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 205 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 21366675 is about 4622.4100856588. The cubic root of 21366675 is about 277.4889209115.

The spelling of 21366675 in words is "twenty-one million, three hundred sixty-six thousand, six hundred seventy-five".