242505221 has 16 divisors (see below), whose sum is σ = 303575040. Its totient is φ = 188885760.

The previous prime is 242505203. The next prime is 242505223. The reversal of 242505221 is 122505242.

242505221 = T₁₄₈ + T₁₄₉ + ... + T₁₁₃₃.

It is not a de Polignac number, because 242505221 - 2¹⁴ = 242488837 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 (242505223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31685 + ... + 38586.

It is an arithmetic number, because the mean of its divisors is an integer number (18973440).

Almost surely, 2^242505221 is an apocalyptic number.

It is an amenable number.

242505221 is a deficient number, since it is larger than the sum of its proper divisors (61069819).

242505221 is a wasteful number, since it uses less digits than its factorization.

242505221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70324.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 242505221 is about 15572.5791377023. The cubic root of 242505221 is about 623.6013275328.

The spelling of 242505221 in words is "two hundred forty-two million, five hundred five thousand, two hundred twenty-one".