21106544 has 20 divisors (see below), whose sum is σ = 41149896. Its totient is φ = 10487232.

The previous prime is 21106543. The next prime is 21106573. The reversal of 21106544 is 44560112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439 + ... + 6654.

Almost surely, 2^21106544 is an apocalyptic number.

It is an amenable number.

21106544 is a deficient number, since it is larger than the sum of its proper divisors (20043352).

21106544 is a wasteful number, since it uses less digits than its factorization.

21106544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8264 (or 8258 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21106544 is about 4594.1858908843. The cubic root of 21106544 is about 276.3582130326.

Adding to 21106544 its reverse (44560112), we get a palindrome (65666656).

The spelling of 21106544 in words is "twenty-one million, one hundred six thousand, five hundred forty-four".