312121212 has 48 divisors (see below), whose sum is σ = 785582112. Its totient is φ = 95880960.

The previous prime is 312121129. The next prime is 312121217. The reversal of 312121212 is 212121213.

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

312121212 is a modest number, since divided by 121212 gives 312 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 312121191 and 312121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312121217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126858 + ... + 129294.

It is an arithmetic number, because the mean of its divisors is an integer number (16366294).

Almost surely, 2^312121212 is an apocalyptic number.

It is an amenable number.

312121212 is an abundant number, since it is smaller than the sum of its proper divisors (473460900).

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

312121212 is a wasteful number, since it uses less digits than its factorization.

312121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278 (or 3276 counting only the distinct ones).

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

The square root of 312121212 is about 17666.9525385676. The cubic root of 312121212 is about 678.3301096074.

Adding to 312121212 its reverse (212121213), we get a palindrome (524242425).

Subtracting from 312121212 its reverse (212121213), we obtain a palindrome (99999999).

The spelling of 312121212 in words is "three hundred twelve million, one hundred twenty-one thousand, two hundred twelve".