21022041 has 4 divisors (see below), whose sum is σ = 28029392. Its totient is φ = 14014692.

The previous prime is 21022021. The next prime is 21022049. The reversal of 21022041 is 14022012.

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 not a de Polignac number, because 21022041 - 2⁵ = 21022009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21022049) 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, 3503671 + ... + 3503676.

It is an arithmetic number, because the mean of its divisors is an integer number (7007348).

Almost surely, 2^21022041 is an apocalyptic number.

It is an amenable number.

21022041 is a deficient number, since it is larger than the sum of its proper divisors (7007351).

21022041 is an equidigital number, since it uses as much as digits as its factorization.

21022041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007350.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21022041 is about 4584.9799345253. The cubic root of 21022041 is about 275.9889068215.

Adding to 21022041 its reverse (14022012), we get a palindrome (35044053).

The spelling of 21022041 in words is "twenty-one million, twenty-two thousand, forty-one".