21452105 has 8 divisors (see below), whose sum is σ = 26179200. Its totient is φ = 16870576.

The previous prime is 21452087. The next prime is 21452111. The reversal of 21452105 is 50125412.

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 21452105 - 2⁸ = 21451849 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36065 + ... + 36654.

It is an arithmetic number, because the mean of its divisors is an integer number (3272400).

Almost surely, 2^21452105 is an apocalyptic number.

It is an amenable number.

21452105 is a deficient number, since it is larger than the sum of its proper divisors (4727095).

21452105 is an equidigital number, since it uses as much as digits as its factorization.

21452105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72783.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 21452105 is about 4631.6417175770. The cubic root of 21452105 is about 277.8582554670.

Adding to 21452105 its reverse (50125412), we get a palindrome (71577517).

The spelling of 21452105 in words is "twenty-one million, four hundred fifty-two thousand, one hundred five".