21275703 has 40 divisors (see below), whose sum is σ = 33841280. Its totient is φ = 13296960.

The previous prime is 21275699. The next prime is 21275707. The reversal of 21275703 is 30757212.

It is an interprime number because it is at equal distance from previous prime (21275699) and next prime (21275707).

It is not a de Polignac number, because 21275703 - 2² = 21275699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275707) 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 39 ways as a sum of consecutive naturals, for example, 92793 + ... + 93021.

It is an arithmetic number, because the mean of its divisors is an integer number (846032).

Almost surely, 2^21275703 is an apocalyptic number.

21275703 is a deficient number, since it is larger than the sum of its proper divisors (12565577).

21275703 is a wasteful number, since it uses less digits than its factorization.

21275703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 21275703 is about 4612.5592679119. The cubic root of 21275703 is about 277.0945430079.

The spelling of 21275703 in words is "twenty-one million, two hundred seventy-five thousand, seven hundred three".