21454105 has 8 divisors (see below), whose sum is σ = 25785864. Its totient is φ = 17136000.

The previous prime is 21454099. The next prime is 21454123. The reversal of 21454105 is 50145412.

It can be written as a sum of positive squares in 4 ways, for example, as 1926544 + 19527561 = 1388^2 + 4419^2 .

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

It is not a de Polignac number, because 21454105 - 2⁷ = 21453977 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (3223233).

Almost surely, 2^21454105 is an apocalyptic number.

It is an amenable number.

21454105 is a deficient number, since it is larger than the sum of its proper divisors (4331759).

21454105 is an equidigital number, since it uses as much as digits as its factorization.

21454105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6827.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 21454105 is about 4631.8576187098. The cubic root of 21454105 is about 277.8668901944.

Adding to 21454105 its reverse (50145412), we get a palindrome (71599517).

The spelling of 21454105 in words is "twenty-one million, four hundred fifty-four thousand, one hundred five".