21246012 has 36 divisors (see below), whose sum is σ = 53979016. Its totient is φ = 7045920.

The previous prime is 21245981. The next prime is 21246053. The reversal of 21246012 is 21064212.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6198 + ... + 8994.

Almost surely, 2^21246012 is an apocalyptic number.

It is an amenable number.

21246012 is an abundant number, since it is smaller than the sum of its proper divisors (32733004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21246012 is a wasteful number, since it uses less digits than its factorization.

21246012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018 (or 3013 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21246012 is about 4609.3396490170. The cubic root of 21246012 is about 276.9655845716.

The spelling of 21246012 in words is "twenty-one million, two hundred forty-six thousand, twelve".