21041423 has 8 divisors (see below), whose sum is σ = 22715616. Its totient is φ = 19375200.

The previous prime is 21041411. The next prime is 21041429. The reversal of 21041423 is 32414012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21041423 - 2⁴ = 21041407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4238 + ... + 7748.

It is an arithmetic number, because the mean of its divisors is an integer number (2839452).

Almost surely, 2^21041423 is an apocalyptic number.

21041423 is a deficient number, since it is larger than the sum of its proper divisors (1674193).

21041423 is a wasteful number, since it uses less digits than its factorization.

21041423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21041423 is about 4587.0930882205. The cubic root of 21041423 is about 276.0736999500.

Adding to 21041423 its reverse (32414012), we get a palindrome (53455435).

It can be divided in two parts, 2104 and 1423, that multiplied together give a palindrome (2993992).

The spelling of 21041423 in words is "twenty-one million, forty-one thousand, four hundred twenty-three".