21941056 has 28 divisors (see below), whose sum is σ = 44947840. Its totient is φ = 10615680.

The previous prime is 21941053. The next prime is 21941113. The reversal of 21941056 is 65014912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941053) 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 3 ways as a sum of consecutive naturals, for example, 3546 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (1605280).

Almost surely, 2^21941056 is an apocalyptic number.

It is an amenable number.

21941056 is an abundant number, since it is smaller than the sum of its proper divisors (23006784).

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

21941056 is a wasteful number, since it uses less digits than its factorization.

21941056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11102 (or 11092 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21941056 is about 4684.1280938932. The cubic root of 21941056 is about 279.9534616531.

Adding to 21941056 its reverse (65014912), we get a palindrome (86955968).

The spelling of 21941056 in words is "twenty-one million, nine hundred forty-one thousand, fifty-six".