21342612 has 12 divisors (see below), whose sum is σ = 49799456. Its totient is φ = 7114200.

The previous prime is 21342583. The next prime is 21342631. The reversal of 21342612 is 21624312.

It is a tau number, because it is divible by the number of its divisors (12).

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889264 + ... + 889287.

Almost surely, 2^21342612 is an apocalyptic number.

It is an amenable number.

21342612 is an abundant number, since it is smaller than the sum of its proper divisors (28456844).

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

21342612 is a wasteful number, since it uses less digits than its factorization.

21342612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778558 (or 1778556 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 21342612 is about 4619.8064894539. The cubic root of 21342612 is about 277.3847130881.

Adding to 21342612 its reverse (21624312), we get a palindrome (42966924).

The spelling of 21342612 in words is "twenty-one million, three hundred forty-two thousand, six hundred twelve".