240971221 has 2 divisors, whose sum is σ = 240971222. Its totient is φ = 240971220.

The previous prime is 240971191. The next prime is 240971239. The reversal of 240971221 is 122179042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168636196 + 72335025 = 12986^2 + 8505^2 .

It is a cyclic number.

It is not a de Polignac number, because 240971221 - 2⁵ = 240971189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240971221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240971261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120485610 + 120485611.

It is an arithmetic number, because the mean of its divisors is an integer number (120485611).

Almost surely, 2^240971221 is an apocalyptic number.

It is an amenable number.

240971221 is a deficient number, since it is larger than the sum of its proper divisors (1).

240971221 is an equidigital number, since it uses as much as digits as its factorization.

240971221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 240971221 is about 15523.2477594091. The cubic root of 240971221 is about 622.2836533606.

The spelling of 240971221 in words is "two hundred forty million, nine hundred seventy-one thousand, two hundred twenty-one".