21107746 has 16 divisors (see below), whose sum is σ = 36358560. Its totient is φ = 9089280.

The previous prime is 21107729. The next prime is 21107753. The reversal of 21107746 is 64770112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24831 + ... + 25666.

It is an arithmetic number, because the mean of its divisors is an integer number (2272410).

Almost surely, 2^21107746 is an apocalyptic number.

21107746 is a deficient number, since it is larger than the sum of its proper divisors (15250814).

21107746 is a wasteful number, since it uses less digits than its factorization.

21107746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50529.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21107746 is about 4594.3167065408. The cubic root of 21107746 is about 276.3634590559.

Adding to 21107746 its reverse (64770112), we get a palindrome (85877858).

The spelling of 21107746 in words is "twenty-one million, one hundred seven thousand, seven hundred forty-six".