21498841 has 16 divisors (see below), whose sum is σ = 27317248. Its totient is φ = 16459200.

The previous prime is 21498817. The next prime is 21498847. The reversal of 21498841 is 14889412.

It is a cyclic number.

It is not a de Polignac number, because 21498841 - 2¹⁹ = 20974553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21498841.

It is not an unprimeable number, because it can be changed into a prime (21498847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (1707328).

Almost surely, 2^21498841 is an apocalyptic number.

It is an amenable number.

21498841 is a deficient number, since it is larger than the sum of its proper divisors (5818407).

21498841 is a wasteful number, since it uses less digits than its factorization.

21498841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7672.

The product of its digits is 18432, while the sum is 37.

The square root of 21498841 is about 4636.6842678794. The cubic root of 21498841 is about 278.0598916905.

The spelling of 21498841 in words is "twenty-one million, four hundred ninety-eight thousand, eight hundred forty-one".