21106672 has 10 divisors (see below), whose sum is σ = 40894208. Its totient is φ = 10553328.

The previous prime is 21106669. The next prime is 21106717. The reversal of 21106672 is 27660112.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 659568 + ... + 659599.

Almost surely, 2^21106672 is an apocalyptic number.

It is an amenable number.

21106672 is a deficient number, since it is larger than the sum of its proper divisors (19787536).

21106672 is a wasteful number, since it uses less digits than its factorization.

21106672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319175 (or 1319169 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21106672 is about 4594.1998215141. The cubic root of 21106672 is about 276.3587716868.

Adding to 21106672 its reverse (27660112), we get a palindrome (48766784).

The spelling of 21106672 in words is "twenty-one million, one hundred six thousand, six hundred seventy-two".