123120011221111 has 2 divisors, whose sum is σ = 123120011221112. Its totient is φ = 123120011221110.

The previous prime is 123120011221099. The next prime is 123120011221127. The reversal of 123120011221111 is 111122110021321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123120011221111 - 2²³ = 123120002832503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123120011221171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560005610555 + 61560005610556.

It is an arithmetic number, because the mean of its divisors is an integer number (61560005610556).

Almost surely, 2^{123120011221111} is an apocalyptic number.

123120011221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

123120011221111 is an equidigital number, since it uses as much as digits as its factorization.

123120011221111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 123120011221111 its reverse (111122110021321), we get a palindrome (234242121242432).

The spelling of 123120011221111 in words is "one hundred twenty-three trillion, one hundred twenty billion, eleven million, two hundred twenty-one thousand, one hundred eleven".