201220111 has 4 divisors (see below), whose sum is σ = 201261424. Its totient is φ = 201178800.

The previous prime is 201220073. The next prime is 201220199. The reversal of 201220111 is 111022102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111022102 = 2 ⋅55511051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201220111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12195 + ... + 23476.

It is an arithmetic number, because the mean of its divisors is an integer number (50315356).

Almost surely, 2^201220111 is an apocalyptic number.

201220111 is a deficient number, since it is larger than the sum of its proper divisors (41313).

201220111 is an equidigital number, since it uses as much as digits as its factorization.

201220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41312.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 201220111 is about 14185.2074711652. The cubic root of 201220111 is about 585.9903462632.

Adding to 201220111 its reverse (111022102), we get a palindrome (312242213).

The spelling of 201220111 in words is "two hundred one million, two hundred twenty thousand, one hundred eleven".