21828703 has 4 divisors (see below), whose sum is σ = 23507848. Its totient is φ = 20149560.

The previous prime is 21828689. The next prime is 21828707. The reversal of 21828703 is 30782812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21828703 - 2⁵ = 21828671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839553 + ... + 839578.

It is an arithmetic number, because the mean of its divisors is an integer number (5876962).

Almost surely, 2^21828703 is an apocalyptic number.

21828703 is a deficient number, since it is larger than the sum of its proper divisors (1679145).

21828703 is a wasteful number, since it uses less digits than its factorization.

21828703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679144.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 21828703 is about 4672.1197544584. The cubic root of 21828703 is about 279.4747935278.

The spelling of 21828703 in words is "twenty-one million, eight hundred twenty-eight thousand, seven hundred three".