21674523 has 16 divisors (see below), whose sum is σ = 31239936. Its totient is φ = 13287840.

The previous prime is 21674501. The next prime is 21674539. The reversal of 21674523 is 32547612.

It is not a de Polignac number, because 21674523 - 2⁵ = 21674491 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21674123) 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 15 ways as a sum of consecutive naturals, for example, 11236 + ... + 13022.

It is an arithmetic number, because the mean of its divisors is an integer number (1952496).

Almost surely, 2^21674523 is an apocalyptic number.

21674523 is a deficient number, since it is larger than the sum of its proper divisors (9565413).

21674523 is a wasteful number, since it uses less digits than its factorization.

21674523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114.

The product of its digits is 10080, while the sum is 30.

The square root of 21674523 is about 4655.5905103435. The cubic root of 21674523 is about 278.8152449043.

The spelling of 21674523 in words is "twenty-one million, six hundred seventy-four thousand, five hundred twenty-three".