21434463 has 20 divisors (see below), whose sum is σ = 32147280. Its totient is φ = 14232672.

The previous prime is 21434453. The next prime is 21434471. The reversal of 21434463 is 36443412.

21434463 is a `hidden beast` number, since 214 + 3 + 446 + 3 = 666.

It is not a de Polignac number, because 21434463 - 2¹⁰ = 21433439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434453) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32806 + ... + 33452.

It is an arithmetic number, because the mean of its divisors is an integer number (1607364).

Almost surely, 2^21434463 is an apocalyptic number.

21434463 is a deficient number, since it is larger than the sum of its proper divisors (10712817).

21434463 is an equidigital number, since it uses as much as digits as its factorization.

21434463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1059 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 21434463 is about 4629.7368175740. The cubic root of 21434463 is about 277.7820652790.

Adding to 21434463 its reverse (36443412), we get a palindrome (57877875).

The spelling of 21434463 in words is "twenty-one million, four hundred thirty-four thousand, four hundred sixty-three".