21452153 has 4 divisors (see below), whose sum is σ = 21754368. Its totient is φ = 21149940.

The previous prime is 21452149. The next prime is 21452161. The reversal of 21452153 is 35125412.

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 21452153 - 2² = 21452149 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21457153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151001 + ... + 151142.

It is an arithmetic number, because the mean of its divisors is an integer number (5438592).

Almost surely, 2^21452153 is an apocalyptic number.

It is an amenable number.

21452153 is a deficient number, since it is larger than the sum of its proper divisors (302215).

21452153 is an equidigital number, since it uses as much as digits as its factorization.

21452153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302214.

The product of its digits is 1200, while the sum is 23.

The square root of 21452153 is about 4631.6468993221. The cubic root of 21452153 is about 277.8584627067.

Adding to 21452153 its reverse (35125412), we get a palindrome (56577565).

The spelling of 21452153 in words is "twenty-one million, four hundred fifty-two thousand, one hundred fifty-three".