123211312 has 20 divisors (see below), whose sum is σ = 272825296. Its totient is φ = 52804800.

The previous prime is 123211307. The next prime is 123211321. The reversal of 123211312 is 213112321.

It is a super-2 number, since 2×123211312² = 30362054809522688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 549939 + ... + 550162.

Almost surely, 2^123211312 is an apocalyptic number.

It is an amenable number.

123211312 is an abundant number, since it is smaller than the sum of its proper divisors (149613984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123211312 is a wasteful number, since it uses less digits than its factorization.

123211312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100116 (or 1100110 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 123211312 is about 11100.0590989418. The cubic root of 123211312 is about 497.6036157001.

Adding to 123211312 its reverse (213112321), we get a palindrome (336323633).

It can be divided in two parts, 1232 and 11312, that added together give a square (12544 = 112²).

The spelling of 123211312 in words is "one hundred twenty-three million, two hundred eleven thousand, three hundred twelve".