201121111 has 2 divisors, whose sum is σ = 201121112. Its totient is φ = 201121110.

The previous prime is 201121103. The next prime is 201121117. The reversal of 201121111 is 111121102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201121111 - 2³ = 201121103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560555 + 100560556.

It is an arithmetic number, because the mean of its divisors is an integer number (100560556).

Almost surely, 2^201121111 is an apocalyptic number.

201121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121111 is an equidigital number, since it uses as much as digits as its factorization.

201121111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 201121111 is about 14181.7174911927. The cubic root of 201121111 is about 585.8942283674.

Adding to 201121111 its reverse (111121102), we get a palindrome (312242213).

Subtracting from 201121111 its reverse (111121102), we obtain a palindrome (90000009).

The spelling of 201121111 in words is "two hundred one million, one hundred twenty-one thousand, one hundred eleven".