21619424 has 12 divisors (see below), whose sum is σ = 42563304. Its totient is φ = 10809696.

The previous prime is 21619421. The next prime is 21619439. The reversal of 21619424 is 42491612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21619421) 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 as a sum of consecutive naturals, namely, 337772 + ... + 337835.

It is an arithmetic number, because the mean of its divisors is an integer number (3546942).

Almost surely, 2^21619424 is an apocalyptic number.

It is an amenable number.

21619424 is a deficient number, since it is larger than the sum of its proper divisors (20943880).

21619424 is an equidigital number, since it uses as much as digits as its factorization.

21619424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675617 (or 675609 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21619424 is about 4649.6692355478. The cubic root of 21619424 is about 278.5787848406.

The spelling of 21619424 in words is "twenty-one million, six hundred nineteen thousand, four hundred twenty-four".