21464543 has 4 divisors (see below), whose sum is σ = 22397808. Its totient is φ = 20531280.

The previous prime is 21464539. The next prime is 21464549. The reversal of 21464543 is 34546412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21464543 - 2² = 21464539 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 (21464549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466598 + ... + 466643.

It is an arithmetic number, because the mean of its divisors is an integer number (5599452).

Almost surely, 2^21464543 is an apocalyptic number.

21464543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21464543 is a deficient number, since it is larger than the sum of its proper divisors (933265).

21464543 is an equidigital number, since it uses as much as digits as its factorization.

21464543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933264.

The product of its digits is 11520, while the sum is 29.

The square root of 21464543 is about 4632.9842434440. The cubic root of 21464543 is about 277.9119461306.

The spelling of 21464543 in words is "twenty-one million, four hundred sixty-four thousand, five hundred forty-three".