21343512 has 16 divisors (see below), whose sum is σ = 53358840. Its totient is φ = 7114496.

The previous prime is 21343501. The next prime is 21343513. The reversal of 21343512 is 21534312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343513) by changing a digit.

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, 444633 + ... + 444680.

Almost surely, 2^21343512 is an apocalyptic number.

It is an amenable number.

21343512 is an abundant number, since it is smaller than the sum of its proper divisors (32015328).

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

21343512 is a wasteful number, since it uses less digits than its factorization.

21343512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889322 (or 889318 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 21343512 is about 4619.9038951043. The cubic root of 21343512 is about 277.3886120600.

Adding to 21343512 its reverse (21534312), we get a palindrome (42877824).

The spelling of 21343512 in words is "twenty-one million, three hundred forty-three thousand, five hundred twelve".