21423041 has 4 divisors (see below), whose sum is σ = 21524784. Its totient is φ = 21321300.

The previous prime is 21423019. The next prime is 21423053. The reversal of 21423041 is 14032412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21423041 - 2²² = 17228737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50555 + ... + 50976.

It is an arithmetic number, because the mean of its divisors is an integer number (5381196).

Almost surely, 2^21423041 is an apocalyptic number.

It is an amenable number.

21423041 is a deficient number, since it is larger than the sum of its proper divisors (101743).

21423041 is a wasteful number, since it uses less digits than its factorization.

21423041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101742.

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

The square root of 21423041 is about 4628.5031057568. The cubic root of 21423041 is about 277.7327149952.

Adding to 21423041 its reverse (14032412), we get a palindrome (35455453).

The spelling of 21423041 in words is "twenty-one million, four hundred twenty-three thousand, forty-one".