123201211123 has 4 divisors (see below), whose sum is σ = 123296791320. Its totient is φ = 123105630928.

The previous prime is 123201211093. The next prime is 123201211153. The reversal of 123201211123 is 321112102321.

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

It is an interprime number because it is at equal distance from previous prime (123201211093) and next prime (123201211153).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123201211123 is a prime.

It is a super-2 number, since 2×123201211123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123201211123.

It is not an unprimeable number, because it can be changed into a prime (123201211153) 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 3 ways as a sum of consecutive naturals, for example, 47788165 + ... + 47790742.

It is an arithmetic number, because the mean of its divisors is an integer number (30824197830).

Almost surely, 2^123201211123 is an apocalyptic number.

123201211123 is a deficient number, since it is larger than the sum of its proper divisors (95580197).

123201211123 is an equidigital number, since it uses as much as digits as its factorization.

123201211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95580196.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 123201211123 its reverse (321112102321), we get a palindrome (444313313444).

The spelling of 123201211123 in words is "one hundred twenty-three billion, two hundred one million, two hundred eleven thousand, one hundred twenty-three".