21343012 has 6 divisors (see below), whose sum is σ = 37350278. Its totient is φ = 10671504.

The previous prime is 21343009. The next prime is 21343013. The reversal of 21343012 is 21034312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 1218816 = 4486^2 + 1104^2 .

It is a super-2 number, since 2×21343012² = 911048322464288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21343013) 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 as a sum of consecutive naturals, namely, 2667873 + ... + 2667880.

Almost surely, 2^21343012 is an apocalyptic number.

It is an amenable number.

21343012 is a deficient number, since it is larger than the sum of its proper divisors (16007266).

21343012 is a wasteful number, since it uses less digits than its factorization.

21343012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335757 (or 5335755 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21343012 is about 4619.8497811076. The cubic root of 21343012 is about 277.3864459780.

Adding to 21343012 its reverse (21034312), we get a palindrome (42377324).

The spelling of 21343012 in words is "twenty-one million, three hundred forty-three thousand, twelve".