21652273 has 2 divisors, whose sum is σ = 21652274. Its totient is φ = 21652272.

The previous prime is 21652219. The next prime is 21652283. The reversal of 21652273 is 37225612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21233664 + 418609 = 4608^2 + 647^2 .

It is a cyclic number.

It is not a de Polignac number, because 21652273 - 2²¹ = 19555121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21652283) 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 as a sum of consecutive naturals, namely, 10826136 + 10826137.

It is an arithmetic number, because the mean of its divisors is an integer number (10826137).

Almost surely, 2^21652273 is an apocalyptic number.

It is an amenable number.

21652273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21652273 is an equidigital number, since it uses as much as digits as its factorization.

21652273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 21652273 is about 4653.2002965701. The cubic root of 21652273 is about 278.7198062304.

Adding to 21652273 its reverse (37225612), we get a palindrome (58877885).

The spelling of 21652273 in words is "twenty-one million, six hundred fifty-two thousand, two hundred seventy-three".