201212111 has 4 divisors (see below), whose sum is σ = 201789000. Its totient is φ = 200635224.

The previous prime is 201212107. The next prime is 201212113. The reversal of 201212111 is 111212102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201212111 - 2² = 201212107 is a prime.

It is a super-2 number, since 2×201212111² = 80972627226152642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201212092 and 201212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212113) 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 3 ways as a sum of consecutive naturals, for example, 287921 + ... + 288618.

It is an arithmetic number, because the mean of its divisors is an integer number (50447250).

Almost surely, 2^201212111 is an apocalyptic number.

201212111 is a deficient number, since it is larger than the sum of its proper divisors (576889).

201212111 is an equidigital number, since it uses as much as digits as its factorization.

201212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576888.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 201212111 is about 14184.9254844712. The cubic root of 201212111 is about 585.9825803315.

Adding to 201212111 its reverse (111212102), we get a palindrome (312424213).

Subtracting from 201212111 its reverse (111212102), we obtain a palindrome (90000009).

The spelling of 201212111 in words is "two hundred one million, two hundred twelve thousand, one hundred eleven".