21844946 has 32 divisors (see below), whose sum is σ = 36590400. Its totient is φ = 9737280.

The previous prime is 21844939. The next prime is 21844967. The reversal of 21844946 is 64944812.

It is a super-3 number, since 3×21844946³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

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 in 15 ways as a sum of consecutive naturals, for example, 47156 + ... + 47616.

It is an arithmetic number, because the mean of its divisors is an integer number (1143450).

Almost surely, 2^21844946 is an apocalyptic number.

21844946 is a deficient number, since it is larger than the sum of its proper divisors (14745454).

21844946 is a wasteful number, since it uses less digits than its factorization.

21844946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554.

The product of its digits is 55296, while the sum is 38.

The square root of 21844946 is about 4673.8577214117. The cubic root of 21844946 is about 279.5440965240.

The spelling of 21844946 in words is "twenty-one million, eight hundred forty-four thousand, nine hundred forty-six".