21748675 has 12 divisors (see below), whose sum is σ = 29043280. Its totient is φ = 16060320.

The previous prime is 21748651. The next prime is 21748687. The reversal of 21748675 is 57684712.

It is not a de Polignac number, because 21748675 - 2¹³ = 21740483 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33135 + ... + 33784.

Almost surely, 2^21748675 is an apocalyptic number.

21748675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21748675 is a deficient number, since it is larger than the sum of its proper divisors (7294605).

21748675 is a wasteful number, since it uses less digits than its factorization.

21748675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66942 (or 66937 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 21748675 is about 4663.5474694700. The cubic root of 21748675 is about 279.1328401379.

The spelling of 21748675 in words is "twenty-one million, seven hundred forty-eight thousand, six hundred seventy-five".