21104231 has 16 divisors (see below), whose sum is σ = 22915200. Its totient is φ = 19375200.

The previous prime is 21104221. The next prime is 21104233. The reversal of 21104231 is 13240112.

It is a cyclic number.

It is not a de Polignac number, because 21104231 - 2¹⁰ = 21103207 is a prime.

It is a super-2 number, since 2×21104231² = 890777132202722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151760 + ... + 151898.

It is an arithmetic number, because the mean of its divisors is an integer number (1432200).

Almost surely, 2^21104231 is an apocalyptic number.

21104231 is a deficient number, since it is larger than the sum of its proper divisors (1810969).

21104231 is a wasteful number, since it uses less digits than its factorization.

21104231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21104231 is about 4593.9341527715. The cubic root of 21104231 is about 276.3481175870.

Adding to 21104231 its reverse (13240112), we get a palindrome (34344343).

The spelling of 21104231 in words is "twenty-one million, one hundred four thousand, two hundred thirty-one".