21426612 has 24 divisors (see below), whose sum is σ = 50139936. Its totient is φ = 7121568.

The previous prime is 21426607. The next prime is 21426631. The reversal of 21426612 is 21662412.

It is a nude number because it is divisible by every one of its digits.

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 7 ways as a sum of consecutive naturals, for example, 2083 + ... + 6869.

It is an arithmetic number, because the mean of its divisors is an integer number (2089164).

Almost surely, 2^21426612 is an apocalyptic number.

It is an amenable number.

21426612 is an abundant number, since it is smaller than the sum of its proper divisors (28713324).

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

21426612 is a wasteful number, since it uses less digits than its factorization.

21426612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167 (or 5165 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21426612 is about 4628.8888515496. Note that the first 4 decimals coincide. The cubic root of 21426612 is about 277.7481458643.

The spelling of 21426612 in words is "twenty-one million, four hundred twenty-six thousand, six hundred twelve".