240515221 has 2 divisors, whose sum is σ = 240515222. Its totient is φ = 240515220.

The previous prime is 240515161. The next prime is 240515227. The reversal of 240515221 is 122515042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 36168196 = 14295^2 + 6014^2 .

It is a cyclic number.

It is not a de Polignac number, because 240515221 - 2¹⁵ = 240482453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 240515192 and 240515201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240515227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120257610 + 120257611.

It is an arithmetic number, because the mean of its divisors is an integer number (120257611).

Almost surely, 2^240515221 is an apocalyptic number.

It is an amenable number.

240515221 is a deficient number, since it is larger than the sum of its proper divisors (1).

240515221 is an equidigital number, since it uses as much as digits as its factorization.

240515221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 240515221 is about 15508.5531562425. The cubic root of 240515221 is about 621.8908809729.

The spelling of 240515221 in words is "two hundred forty million, five hundred fifteen thousand, two hundred twenty-one".