201242121 has 12 divisors (see below), whose sum is σ = 270996048. Its totient is φ = 132837864.

The previous prime is 201242033. The next prime is 201242131. The reversal of 201242121 is 121242102.

It is not a de Polignac number, because 201242121 - 2¹⁵ = 201209353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201242121.

It is not an unprimeable number, because it can be changed into a prime (201242131) 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, 28666 + ... + 34988.

It is an arithmetic number, because the mean of its divisors is an integer number (22583004).

Almost surely, 2^201242121 is an apocalyptic number.

It is an amenable number.

201242121 is a deficient number, since it is larger than the sum of its proper divisors (69753927).

201242121 is an equidigital number, since it uses as much as digits as its factorization.

201242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6532 (or 6429 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 201242121 is about 14185.9832581320. The cubic root of 201242121 is about 586.0117112206.

Adding to 201242121 its reverse (121242102), we get a palindrome (322484223).

The spelling of 201242121 in words is "two hundred one million, two hundred forty-two thousand, one hundred twenty-one".