21343465 has 16 divisors (see below), whose sum is σ = 30090816. Its totient is φ = 14328000.

The previous prime is 21343463. The next prime is 21343477. The reversal of 21343465 is 56434312.

It is not a de Polignac number, because 21343465 - 2¹ = 21343463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343463) by changing a digit.

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, 14211 + ... + 15640.

It is an arithmetic number, because the mean of its divisors is an integer number (1880676).

Almost surely, 2^21343465 is an apocalyptic number.

It is an amenable number.

21343465 is a deficient number, since it is larger than the sum of its proper divisors (8747351).

21343465 is a wasteful number, since it uses less digits than its factorization.

21343465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29880.

The product of its digits is 8640, while the sum is 28.

The square root of 21343465 is about 4619.8988084156. The cubic root of 21343465 is about 277.3884084497.

Adding to 21343465 its reverse (56434312), we get a palindrome (77777777).

The spelling of 21343465 in words is "twenty-one million, three hundred forty-three thousand, four hundred sixty-five".