21746012 has 12 divisors (see below), whose sum is σ = 38679816. Its totient is φ = 10694640.

The previous prime is 21745991. The next prime is 21746029. The reversal of 21746012 is 21064712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44318 + ... + 44805.

It is an arithmetic number, because the mean of its divisors is an integer number (3223318).

Almost surely, 2^21746012 is an apocalyptic number.

It is an amenable number.

21746012 is a deficient number, since it is larger than the sum of its proper divisors (16933804).

21746012 is a wasteful number, since it uses less digits than its factorization.

21746012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89188 (or 89186 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21746012 is about 4663.2619484648. The cubic root of 21746012 is about 279.1214469367.

The spelling of 21746012 in words is "twenty-one million, seven hundred forty-six thousand, twelve".