21051041 has 8 divisors (see below), whose sum is σ = 23242464. Its totient is φ = 18905920.

The previous prime is 21051029. The next prime is 21051047. The reversal of 21051041 is 14015012.

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

It is not a de Polignac number, because 21051041 - 2¹⁰ = 21050017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21051047) 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, 10616 + ... + 12441.

It is an arithmetic number, because the mean of its divisors is an integer number (2905308).

Almost surely, 2^21051041 is an apocalyptic number.

It is an amenable number.

21051041 is a deficient number, since it is larger than the sum of its proper divisors (2191423).

21051041 is a wasteful number, since it uses less digits than its factorization.

21051041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23151.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21051041 is about 4588.1413448149. The cubic root of 21051041 is about 276.1157578212.

Adding to 21051041 its reverse (14015012), we get a palindrome (35066053).

The spelling of 21051041 in words is "twenty-one million, fifty-one thousand, forty-one".