123120011211 has 4 divisors (see below), whose sum is σ = 164160014952. Its totient is φ = 82080007472.

The previous prime is 123120011129. The next prime is 123120011213. The reversal of 123120011211 is 112110021321.

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 123120011211 - 2¹¹ = 123120009163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123120011213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20520001866 + ... + 20520001871.

It is an arithmetic number, because the mean of its divisors is an integer number (41040003738).

Almost surely, 2^123120011211 is an apocalyptic number.

123120011211 is a deficient number, since it is larger than the sum of its proper divisors (41040003741).

123120011211 is an equidigital number, since it uses as much as digits as its factorization.

123120011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41040003740.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 123120011211 its reverse (112110021321), we get a palindrome (235230032532).

The spelling of 123120011211 in words is "one hundred twenty-three billion, one hundred twenty million, eleven thousand, two hundred eleven".