240244021 has 2 divisors, whose sum is σ = 240244022. Its totient is φ = 240244020.

The previous prime is 240244009. The next prime is 240244031. The reversal of 240244021 is 120442042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240095025 + 148996 = 15495^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 240244021 - 2²⁵ = 206689589 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240244021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240244001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120122010 + 120122011.

It is an arithmetic number, because the mean of its divisors is an integer number (120122011).

Almost surely, 2^240244021 is an apocalyptic number.

It is an amenable number.

240244021 is a deficient number, since it is larger than the sum of its proper divisors (1).

240244021 is an equidigital number, since it uses as much as digits as its factorization.

240244021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 240244021 is about 15499.8071278323. The cubic root of 240244021 is about 621.6570492882.

Adding to 240244021 its reverse (120442042), we get a palindrome (360686063).

The spelling of 240244021 in words is "two hundred forty million, two hundred forty-four thousand, twenty-one".