21343463 has 2 divisors, whose sum is σ = 21343464. Its totient is φ = 21343462.

The previous prime is 21343457. The next prime is 21343477. The reversal of 21343463 is 36434312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671731 + 10671732.

It is an arithmetic number, because the mean of its divisors is an integer number (10671732).

Almost surely, 2^21343463 is an apocalyptic number.

21343463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343463 is an equidigital number, since it uses as much as digits as its factorization.

21343463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 26.

The square root of 21343463 is about 4619.8985919607. The cubic root of 21343463 is about 277.3883997854.

Adding to 21343463 its reverse (36434312), we get a palindrome (57777775).

The spelling of 21343463 in words is "twenty-one million, three hundred forty-three thousand, four hundred sixty-three".