21452401 has 4 divisors (see below), whose sum is σ = 21542400. Its totient is φ = 21362404.

The previous prime is 21452393. The next prime is 21452407. The reversal of 21452401 is 10425412.

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 21452401 - 2³ = 21452393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21452407) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 44641 + ... + 45118.

It is an arithmetic number, because the mean of its divisors is an integer number (5385600).

Almost surely, 2^21452401 is an apocalyptic number.

It is an amenable number.

21452401 is a deficient number, since it is larger than the sum of its proper divisors (89999).

21452401 is an equidigital number, since it uses as much as digits as its factorization.

21452401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89998.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21452401 is about 4631.6736715792. The cubic root of 21452401 is about 277.8595334405.

Adding to 21452401 its reverse (10425412), we get a palindrome (31877813).

The spelling of 21452401 in words is "twenty-one million, four hundred fifty-two thousand, four hundred one".