21418812 has 36 divisors (see below), whose sum is σ = 54401256. Its totient is φ = 7105440.

The previous prime is 21418807. The next prime is 21418823. The reversal of 21418812 is 21881412.

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

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 6862 + ... + 9482.

It is an arithmetic number, because the mean of its divisors is an integer number (1511146).

Almost surely, 2^21418812 is an apocalyptic number.

It is an amenable number.

21418812 is an abundant number, since it is smaller than the sum of its proper divisors (32982444).

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

21418812 is a wasteful number, since it uses less digits than its factorization.

21418812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858 (or 2853 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 21418812 is about 4628.0462400456. The cubic root of 21418812 is about 277.7144385836.

The spelling of 21418812 in words is "twenty-one million, four hundred eighteen thousand, eight hundred twelve".