21342012 has 48 divisors (see below), whose sum is σ = 51996672. Its totient is φ = 6805440.

The previous prime is 21342001. The next prime is 21342023. The reversal of 21342012 is 21024312.

It is an interprime number because it is at equal distance from previous prime (21342001) and next prime (21342023).

It is a junction number, because it is equal to n+sod(n) for n = 21341982 and 21342000.

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 15 ways as a sum of consecutive naturals, for example, 38038 + ... + 38594.

It is an arithmetic number, because the mean of its divisors is an integer number (1083264).

Almost surely, 2^21342012 is an apocalyptic number.

It is an amenable number.

21342012 is an abundant number, since it is smaller than the sum of its proper divisors (30654660).

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

21342012 is a wasteful number, since it uses less digits than its factorization.

21342012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21342012 is about 4619.7415512126. The cubic root of 21342012 is about 277.3821137126.

Adding to 21342012 its reverse (21024312), we get a palindrome (42366324).

The spelling of 21342012 in words is "twenty-one million, three hundred forty-two thousand, twelve".