21343487 has 12 divisors (see below), whose sum is σ = 24017976. Its totient is φ = 18796320.

The previous prime is 21343481. The next prime is 21343489. The reversal of 21343487 is 78434312.

It is not a de Polignac number, because 21343487 - 2¹² = 21339391 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93089 + ... + 93317.

It is an arithmetic number, because the mean of its divisors is an integer number (2001498).

Almost surely, 2^21343487 is an apocalyptic number.

21343487 is a deficient number, since it is larger than the sum of its proper divisors (2674489).

21343487 is an equidigital number, since it uses as much as digits as its factorization.

21343487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 277 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 21343487 is about 4619.9011894195. The cubic root of 21343487 is about 277.3885037567.

Adding to 21343487 its reverse (78434312), we get a palindrome (99777799).

The spelling of 21343487 in words is "twenty-one million, three hundred forty-three thousand, four hundred eighty-seven".