21058012 has 12 divisors (see below), whose sum is σ = 36892800. Its totient is φ = 10517216.

The previous prime is 21058001. The next prime is 21058027. The reversal of 21058012 is 21085012.

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 3 ways as a sum of consecutive naturals, for example, 1989 + ... + 6787.

It is an arithmetic number, because the mean of its divisors is an integer number (3074400).

Almost surely, 2^21058012 is an apocalyptic number.

It is an amenable number.

21058012 is a deficient number, since it is larger than the sum of its proper divisors (15834788).

21058012 is a wasteful number, since it uses less digits than its factorization.

21058012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5900 (or 5898 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 21058012 is about 4588.9009577458. The cubic root of 21058012 is about 276.1462328069.

Subtracting 21058012 from its reverse (21085012), we obtain a cube (27000 = 30³).

The spelling of 21058012 in words is "twenty-one million, fifty-eight thousand, twelve".