123121212 has 72 divisors (see below), whose sum is σ = 305303040. Its totient is φ = 38576160.

The previous prime is 123121189. The next prime is 123121217. The reversal of 123121212 is 212121321.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 123121191 and 123121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 687739 + ... + 687917.

It is an arithmetic number, because the mean of its divisors is an integer number (4240320).

Almost surely, 2^123121212 is an apocalyptic number.

123121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123121212 is an abundant number, since it is smaller than the sum of its proper divisors (182181828).

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

123121212 is a wasteful number, since it uses less digits than its factorization.

123121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 258 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 123121212 is about 11095.9998197549. Note that the first 3 decimals coincide. The cubic root of 123121212 is about 497.4822929146.

Adding to 123121212 its reverse (212121321), we get a palindrome (335242533).

The spelling of 123121212 in words is "one hundred twenty-three million, one hundred twenty-one thousand, two hundred twelve".