21352463 has 8 divisors (see below), whose sum is σ = 23417856. Its totient is φ = 19307800.

The previous prime is 21352451. The next prime is 21352477. The reversal of 21352463 is 36425312.

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 21352463 - 2⁶ = 21352399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352403) 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 in 7 ways as a sum of consecutive naturals, for example, 2981 + ... + 7182.

It is an arithmetic number, because the mean of its divisors is an integer number (2927232).

Almost surely, 2^21352463 is an apocalyptic number.

21352463 is a deficient number, since it is larger than the sum of its proper divisors (2065393).

21352463 is a wasteful number, since it uses less digits than its factorization.

21352463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10365.

The product of its digits is 4320, while the sum is 26.

The square root of 21352463 is about 4620.8725366537. The cubic root of 21352463 is about 277.4273835370.

Adding to 21352463 its reverse (36425312), we get a palindrome (57777775).

The spelling of 21352463 in words is "twenty-one million, three hundred fifty-two thousand, four hundred sixty-three".