21273675 has 24 divisors (see below), whose sum is σ = 36389040. Its totient is φ = 10953600.

The previous prime is 21273641. The next prime is 21273683. The reversal of 21273675 is 57637212.

It is not a de Polignac number, because 21273675 - 2⁶ = 21273611 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2716 + ... + 7065.

It is an arithmetic number, because the mean of its divisors is an integer number (1516210).

Almost surely, 2^21273675 is an apocalyptic number.

21273675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21273675 is a deficient number, since it is larger than the sum of its proper divisors (15115365).

21273675 is a wasteful number, since it uses less digits than its factorization.

21273675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9823 (or 9818 counting only the distinct ones).

The product of its digits is 17640, while the sum is 33.

The square root of 21273675 is about 4612.3394280994. The cubic root of 21273675 is about 277.0857385109.

The spelling of 21273675 in words is "twenty-one million, two hundred seventy-three thousand, six hundred seventy-five".