21454559 has 8 divisors (see below), whose sum is σ = 24982560. Its totient is φ = 18042336.

The previous prime is 21454547. The next prime is 21454613. The reversal of 21454559 is 95545412.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21454559 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 (21451559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28544 + ... + 29285.

It is an arithmetic number, because the mean of its divisors is an integer number (3122820).

Almost surely, 2^21454559 is an apocalyptic number.

21454559 is a deficient number, since it is larger than the sum of its proper divisors (3528001).

21454559 is an equidigital number, since it uses as much as digits as its factorization.

21454559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57889.

The product of its digits is 36000, while the sum is 35.

The square root of 21454559 is about 4631.9066268654. The cubic root of 21454559 is about 277.8688502029.

The spelling of 21454559 in words is "twenty-one million, four hundred fifty-four thousand, five hundred fifty-nine".