21292241 has 2 divisors, whose sum is σ = 21292242. Its totient is φ = 21292240.

The previous prime is 21292231. The next prime is 21292253. The reversal of 21292241 is 14229212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17048641 + 4243600 = 4129^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 21292241 - 2¹⁰ = 21291217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21292231) 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, 10646120 + 10646121.

It is an arithmetic number, because the mean of its divisors is an integer number (10646121).

Almost surely, 2^21292241 is an apocalyptic number.

It is an amenable number.

21292241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21292241 is an equidigital number, since it uses as much as digits as its factorization.

21292241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 21292241 is about 4614.3516337618. The cubic root of 21292241 is about 277.1663213284.

The spelling of 21292241 in words is "twenty-one million, two hundred ninety-two thousand, two hundred forty-one".