21674903 has 4 divisors (see below), whose sum is σ = 21889608. Its totient is φ = 21460200.

The previous prime is 21674899. The next prime is 21674911. The reversal of 21674903 is 30947612.

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 21674903 - 2² = 21674899 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21674903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107201 + ... + 107402.

It is an arithmetic number, because the mean of its divisors is an integer number (5472402).

Almost surely, 2^21674903 is an apocalyptic number.

21674903 is a deficient number, since it is larger than the sum of its proper divisors (214705).

21674903 is a wasteful number, since it uses less digits than its factorization.

21674903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214704.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21674903 is about 4655.6313213140. The cubic root of 21674903 is about 278.8168743007.

The spelling of 21674903 in words is "twenty-one million, six hundred seventy-four thousand, nine hundred three".