21938041 has 8 divisors (see below), whose sum is σ = 23769504. Its totient is φ = 20166720.

The previous prime is 21938039. The next prime is 21938057. The reversal of 21938041 is 14083912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21938041 - 2¹ = 21938039 is a prime.

It is a Duffinian number.

21938041 is a modest number, since divided by 8041 gives 2193 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21938641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14275 + ... + 15736.

It is an arithmetic number, because the mean of its divisors is an integer number (2971188).

Almost surely, 2^21938041 is an apocalyptic number.

It is an amenable number.

21938041 is a deficient number, since it is larger than the sum of its proper divisors (1831463).

21938041 is a wasteful number, since it uses less digits than its factorization.

21938041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30071.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21938041 is about 4683.8062513302. The cubic root of 21938041 is about 279.9406379259.

The spelling of 21938041 in words is "twenty-one million, nine hundred thirty-eight thousand, forty-one".