21452611 has 2 divisors, whose sum is σ = 21452612. Its totient is φ = 21452610.

The previous prime is 21452609. The next prime is 21452659. The reversal of 21452611 is 11625412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21452611 - 2¹ = 21452609 is a prime.

Together with 21452609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21452671) 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 as a sum of consecutive naturals, namely, 10726305 + 10726306.

It is an arithmetic number, because the mean of its divisors is an integer number (10726306).

Almost surely, 2^21452611 is an apocalyptic number.

21452611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452611 is an equidigital number, since it uses as much as digits as its factorization.

21452611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 22.

The square root of 21452611 is about 4631.6963415146. The cubic root of 21452611 is about 277.8604401037.

It can be divided in two parts, 214 and 52611, that added together give a palindrome (52825).

The spelling of 21452611 in words is "twenty-one million, four hundred fifty-two thousand, six hundred eleven".