21046012 has 24 divisors (see below), whose sum is σ = 41390496. Its totient is φ = 9290688.

The previous prime is 21046009. The next prime is 21046021. The reversal of 21046012 is 21064012.

It is a super-2 number, since 2×21046012² = 885869242208288, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 7603 + ... + 9994.

It is an arithmetic number, because the mean of its divisors is an integer number (1724604).

Almost surely, 2^21046012 is an apocalyptic number.

It is an amenable number.

21046012 is a deficient number, since it is larger than the sum of its proper divisors (20344484).

21046012 is a wasteful number, since it uses less digits than its factorization.

21046012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17637 (or 17635 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21046012 is about 4587.5932688066. The cubic root of 21046012 is about 276.0937684615.

The spelling of 21046012 in words is "twenty-one million, forty-six thousand, twelve".