201242111 has 32 divisors (see below), whose sum is σ = 252174336. Its totient is φ = 156816000.

The previous prime is 201242033. The next prime is 201242131. The reversal of 201242111 is 111242102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 201242111 - 2¹⁴ = 201225727 is a prime.

It is a congruent number.

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 (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 304121 + ... + 304781.

It is an arithmetic number, because the mean of its divisors is an integer number (7880448).

Almost surely, 2^201242111 is an apocalyptic number.

201242111 is a deficient number, since it is larger than the sum of its proper divisors (50932225).

201242111 is a wasteful number, since it uses less digits than its factorization.

201242111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 201242111 is about 14185.9829056714. The cubic root of 201242111 is about 586.0117015140.

Adding to 201242111 its reverse (111242102), we get a palindrome (312484213).

Subtracting from 201242111 its reverse (111242102), we obtain a palindrome (90000009).

The spelling of 201242111 in words is "two hundred one million, two hundred forty-two thousand, one hundred eleven".