21946144 has 24 divisors (see below), whose sum is σ = 47135088. Its totient is φ = 9975360.

The previous prime is 21946139. The next prime is 21946181. The reversal of 21946144 is 44164912.

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 3 ways as a sum of consecutive naturals, for example, 30822 + ... + 31525.

It is an arithmetic number, because the mean of its divisors is an integer number (1963962).

Almost surely, 2^21946144 is an apocalyptic number.

It is an amenable number.

21946144 is an abundant number, since it is smaller than the sum of its proper divisors (25188944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21946144 is a wasteful number, since it uses less digits than its factorization.

21946144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62368 (or 62360 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 21946144 is about 4684.6711730921. The cubic root of 21946144 is about 279.9750998265.

It can be divided in two parts, 2194 and 6144, that added together give a palindrome (8338).

The spelling of 21946144 in words is "twenty-one million, nine hundred forty-six thousand, one hundred forty-four".