21874241 has 2 divisors, whose sum is σ = 21874242. Its totient is φ = 21874240.

The previous prime is 21874199. The next prime is 21874261. The reversal of 21874241 is 14247812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 2337841 = 4420^2 + 1529^2 .

It is a cyclic number.

It is not a de Polignac number, because 21874241 - 2¹⁰ = 21873217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21874261) 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, 10937120 + 10937121.

It is an arithmetic number, because the mean of its divisors is an integer number (10937121).

Almost surely, 2^21874241 is an apocalyptic number.

It is an amenable number.

21874241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21874241 is an equidigital number, since it uses as much as digits as its factorization.

21874241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 29.

The square root of 21874241 is about 4676.9905922505. The cubic root of 21874241 is about 279.6690008738.

The spelling of 21874241 in words is "twenty-one million, eight hundred seventy-four thousand, two hundred forty-one".