21424612 has 12 divisors (see below), whose sum is σ = 40901616. Its totient is φ = 9738440.

The previous prime is 21424589. The next prime is 21424619. The reversal of 21424612 is 21642412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21424619) by changing a digit.

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, 243418 + ... + 243505.

It is an arithmetic number, because the mean of its divisors is an integer number (3408468).

Almost surely, 2^21424612 is an apocalyptic number.

21424612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21424612 is a deficient number, since it is larger than the sum of its proper divisors (19477004).

21424612 is a wasteful number, since it uses less digits than its factorization.

21424612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486938 (or 486936 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 21424612 is about 4628.6728119408. The cubic root of 21424612 is about 277.7395037518.

The spelling of 21424612 in words is "twenty-one million, four hundred twenty-four thousand, six hundred twelve".