21844348 has 6 divisors (see below), whose sum is σ = 38227616. Its totient is φ = 10922172.

The previous prime is 21844313. The next prime is 21844351. The reversal of 21844348 is 84344812.

It is a happy number.

It is a super-4 number, since 4×21844348⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2730540 + ... + 2730547.

Almost surely, 2^21844348 is an apocalyptic number.

It is an amenable number.

21844348 is a deficient number, since it is larger than the sum of its proper divisors (16383268).

21844348 is a wasteful number, since it uses less digits than its factorization.

21844348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5461091 (or 5461089 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

The square root of 21844348 is about 4673.7937481237. The cubic root of 21844348 is about 279.5415456839.

The spelling of 21844348 in words is "twenty-one million, eight hundred forty-four thousand, three hundred forty-eight".