21241028 has 24 divisors (see below), whose sum is σ = 37975392. Its totient is φ = 10393664.

The previous prime is 21241013. The next prime is 21241037. The reversal of 21241028 is 82014212.

It is a happy 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, 45251 + ... + 45717.

It is an arithmetic number, because the mean of its divisors is an integer number (1582308).

Almost surely, 2^21241028 is an apocalyptic number.

It is an amenable number.

21241028 is a deficient number, since it is larger than the sum of its proper divisors (16734364).

21241028 is a wasteful number, since it uses less digits than its factorization.

21241028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21241028 is about 4608.7989758721. The cubic root of 21241028 is about 276.9439255354.

The spelling of 21241028 in words is "twenty-one million, two hundred forty-one thousand, twenty-eight".