21452417 has 4 divisors (see below), whose sum is σ = 24517056. Its totient is φ = 18387780.

The previous prime is 21452413. The next prime is 21452443. The reversal of 21452417 is 71425412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21452417 - 2² = 21452413 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21452411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1532309 + ... + 1532322.

It is an arithmetic number, because the mean of its divisors is an integer number (6129264).

Almost surely, 2^21452417 is an apocalyptic number.

It is an amenable number.

21452417 is a deficient number, since it is larger than the sum of its proper divisors (3064639).

21452417 is an equidigital number, since it uses as much as digits as its factorization.

21452417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064638.

The product of its digits is 2240, while the sum is 26.

The square root of 21452417 is about 4631.6753988163. The cubic root of 21452417 is about 277.8596025198.

Adding to 21452417 its reverse (71425412), we get a palindrome (92877829).

The spelling of 21452417 in words is "twenty-one million, four hundred fifty-two thousand, four hundred seventeen".