123211028 has 6 divisors (see below), whose sum is σ = 215619306. Its totient is φ = 61605512.

The previous prime is 123211021. The next prime is 123211031. The reversal of 123211028 is 820112321.

It can be written as a sum of positive squares in only one way, i.e., 121837444 + 1373584 = 11038^2 + 1172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123211021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15401375 + ... + 15401382.

It is an arithmetic number, because the mean of its divisors is an integer number (35936551).

Almost surely, 2^123211028 is an apocalyptic number.

It is an amenable number.

123211028 is a deficient number, since it is larger than the sum of its proper divisors (92408278).

123211028 is a wasteful number, since it uses less digits than its factorization.

123211028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30802761 (or 30802759 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 123211028 is about 11100.0463062097. The cubic root of 123211028 is about 497.6032333771.

Adding to 123211028 its reverse (820112321), we get a palindrome (943323349).

The spelling of 123211028 in words is "one hundred twenty-three million, two hundred eleven thousand, twenty-eight".