21169475 has 6 divisors (see below), whose sum is σ = 26250180. Its totient is φ = 16935560.

The previous prime is 21169457. The next prime is 21169481. The reversal of 21169475 is 57496112.

It is not a de Polignac number, because 21169475 - 2⁸ = 21169219 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 423365 + ... + 423414.

It is an arithmetic number, because the mean of its divisors is an integer number (4375030).

Almost surely, 2^21169475 is an apocalyptic number.

21169475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21169475 is a deficient number, since it is larger than the sum of its proper divisors (5080705).

21169475 is an equidigital number, since it uses as much as digits as its factorization.

21169475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846789 (or 846784 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 21169475 is about 4601.0297760393. The cubic root of 21169475 is about 276.6326025382.

The spelling of 21169475 in words is "twenty-one million, one hundred sixty-nine thousand, four hundred seventy-five".