21041845 has 8 divisors (see below), whose sum is σ = 27545760. Its totient is φ = 15303120.

The previous prime is 21041827. The next prime is 21041857. The reversal of 21041845 is 54814012.

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

It is not a de Polignac number, because 21041845 - 2⁷ = 21041717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191235 + ... + 191344.

It is an arithmetic number, because the mean of its divisors is an integer number (3443220).

Almost surely, 2^21041845 is an apocalyptic number.

It is an amenable number.

21041845 is a deficient number, since it is larger than the sum of its proper divisors (6503915).

21041845 is a wasteful number, since it uses less digits than its factorization.

21041845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382595.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21041845 is about 4587.1390866203. The cubic root of 21041845 is about 276.0755455527.

Adding to 21041845 its reverse (54814012), we get a palindrome (75855857).

The spelling of 21041845 in words is "twenty-one million, forty-one thousand, eight hundred forty-five".