242101209 has 12 divisors (see below), whose sum is σ = 375504144. Its totient is φ = 138343464.

The previous prime is 242101177. The next prime is 242101219. The reversal of 242101209 is 902101242.

It is not a de Polignac number, because 242101209 - 2⁵ = 242101177 is a prime.

It is a super-2 number, since 2×242101209² = 117225990798523362, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (242101219) 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 11 ways as a sum of consecutive naturals, for example, 823327 + ... + 823620.

It is an arithmetic number, because the mean of its divisors is an integer number (31292012).

Almost surely, 2^242101209 is an apocalyptic number.

It is an amenable number.

242101209 is a deficient number, since it is larger than the sum of its proper divisors (133402935).

242101209 is a wasteful number, since it uses less digits than its factorization.

242101209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646964 (or 1646957 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 242101209 is about 15559.6018265250. The cubic root of 242101209 is about 623.2548298923.

The spelling of 242101209 in words is "two hundred forty-two million, one hundred one thousand, two hundred nine".