240645221 has 4 divisors (see below), whose sum is σ = 240859500. Its totient is φ = 240430944.

The previous prime is 240645193. The next prime is 240645253. The reversal of 240645221 is 122546042.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122546042 = 2 ⋅61273021.

It can be written as a sum of positive squares in 2 ways, for example, as 87628321 + 153016900 = 9361^2 + 12370^2 .

It is a cyclic number.

It is not a de Polignac number, because 240645221 - 2¹⁴ = 240628837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240645271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105446 + ... + 107703.

It is an arithmetic number, because the mean of its divisors is an integer number (60214875).

Almost surely, 2^240645221 is an apocalyptic number.

It is an amenable number.

240645221 is a deficient number, since it is larger than the sum of its proper divisors (214279).

240645221 is a wasteful number, since it uses less digits than its factorization.

240645221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214278.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 240645221 is about 15512.7438256422. The cubic root of 240645221 is about 622.0029061116.

The spelling of 240645221 in words is "two hundred forty million, six hundred forty-five thousand, two hundred twenty-one".