21422056 has 8 divisors (see below), whose sum is σ = 40166370. Its totient is φ = 10711024.

The previous prime is 21422053. The next prime is 21422077. The reversal of 21422056 is 65022412.

It can be written as a sum of positive squares in only one way, i.e., 20557156 + 864900 = 4534^2 + 930^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21422053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1338871 + ... + 1338886.

Almost surely, 2^21422056 is an apocalyptic number.

It is an amenable number.

21422056 is a deficient number, since it is larger than the sum of its proper divisors (18744314).

21422056 is a wasteful number, since it uses less digits than its factorization.

21422056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677763 (or 2677759 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21422056 is about 4628.3966986420. The cubic root of 21422056 is about 277.7284583490.

Adding to 21422056 its reverse (65022412), we get a palindrome (86444468).

The spelling of 21422056 in words is "twenty-one million, four hundred twenty-two thousand, fifty-six".