21673041 has 16 divisors (see below), whose sum is σ = 31253376. Its totient is φ = 13280256.

The previous prime is 21673039. The next prime is 21673073. The reversal of 21673041 is 14037612.

It is not a de Polignac number, because 21673041 - 2¹ = 21673039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21673021) 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 15 ways as a sum of consecutive naturals, for example, 9201 + ... + 11313.

It is an arithmetic number, because the mean of its divisors is an integer number (1953336).

Almost surely, 2^21673041 is an apocalyptic number.

It is an amenable number.

21673041 is a deficient number, since it is larger than the sum of its proper divisors (9580335).

21673041 is a wasteful number, since it uses less digits than its factorization.

21673041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21673041 is about 4655.4313441399. The cubic root of 21673041 is about 278.8088900760.

The spelling of 21673041 in words is "twenty-one million, six hundred seventy-three thousand, forty-one".