21452773 has 2 divisors, whose sum is σ = 21452774. Its totient is φ = 21452772.

The previous prime is 21452749. The next prime is 21452789. The reversal of 21452773 is 37725412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 859329 = 4538^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 21452773 - 2⁵ = 21452741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21455773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726386 + 10726387.

It is an arithmetic number, because the mean of its divisors is an integer number (10726387).

Almost surely, 2^21452773 is an apocalyptic number.

It is an amenable number.

21452773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452773 is an equidigital number, since it uses as much as digits as its factorization.

21452773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 31.

The square root of 21452773 is about 4631.7138296747. The cubic root of 21452773 is about 277.8611395256.

The spelling of 21452773 in words is "twenty-one million, four hundred fifty-two thousand, seven hundred seventy-three".