123213012111 has 16 divisors (see below), whose sum is σ = 208614624000. Its totient is φ = 70407435384.

The previous prime is 123213012101. The next prime is 123213012119. The reversal of 123213012111 is 111210312321.

123213012111 is a `hidden beast` number, since 12 + 321 + 301 + 21 + 11 = 666.

It is not a de Polignac number, because 123213012111 - 2⁵ = 123213012079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213012119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325960161 + ... + 325960538.

It is an arithmetic number, because the mean of its divisors is an integer number (13038414000).

Almost surely, 2^123213012111 is an apocalyptic number.

123213012111 is a deficient number, since it is larger than the sum of its proper divisors (85401611889).

123213012111 is an equidigital number, since it uses as much as digits as its factorization.

123213012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651920715 (or 651920709 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 123213012111 its reverse (111210312321), we get a palindrome (234423324432).

The spelling of 123213012111 in words is "one hundred twenty-three billion, two hundred thirteen million, twelve thousand, one hundred eleven".