201211123 has 4 divisors (see below), whose sum is σ = 204509728. Its totient is φ = 197912520.

The previous prime is 201211097. The next prime is 201211139. The reversal of 201211123 is 321112102.

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 201211123 - 2¹³ = 201202931 is a prime.

It is a super-2 number, since 2×201211123² = 80971832037842258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201211523) 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, 1649211 + ... + 1649332.

It is an arithmetic number, because the mean of its divisors is an integer number (51127432).

Almost surely, 2^201211123 is an apocalyptic number.

201211123 is a deficient number, since it is larger than the sum of its proper divisors (3298605).

201211123 is an equidigital number, since it uses as much as digits as its factorization.

201211123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298604.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 201211123 is about 14184.8906587256. The cubic root of 201211123 is about 585.9816212247.

Adding to 201211123 its reverse (321112102), we get a palindrome (522323225).

The spelling of 201211123 in words is "two hundred one million, two hundred eleven thousand, one hundred twenty-three".