21342463 has 8 divisors (see below), whose sum is σ = 23377680. Its totient is φ = 19393920.

The previous prime is 21342457. The next prime is 21342473. The reversal of 21342463 is 36424312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21342463 - 2⁹ = 21341951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21153 + ... + 22138.

It is an arithmetic number, because the mean of its divisors is an integer number (2922210).

Almost surely, 2^21342463 is an apocalyptic number.

21342463 is a deficient number, since it is larger than the sum of its proper divisors (2035217).

21342463 is a wasteful number, since it uses less digits than its factorization.

21342463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43337.

The product of its digits is 3456, while the sum is 25.

The square root of 21342463 is about 4619.7903632091. The cubic root of 21342463 is about 277.3840675810.

Adding to 21342463 its reverse (36424312), we get a palindrome (57766775).

The spelling of 21342463 in words is "twenty-one million, three hundred forty-two thousand, four hundred sixty-three".