312421212 has 72 divisors (see below), whose sum is σ = 822524976. Its totient is φ = 103690368.

The previous prime is 312421177. The next prime is 312421231. The reversal of 312421212 is 212124213.

It is a happy number.

312421212 is a `hidden beast` number, since 31 + 2 + 421 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284248 + ... + 285344.

It is an arithmetic number, because the mean of its divisors is an integer number (11423958).

Almost surely, 2^312421212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 312421212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411262488).

312421212 is an abundant number, since it is smaller than the sum of its proper divisors (510103764).

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

312421212 is a wasteful number, since it uses less digits than its factorization.

312421212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1395 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 312421212 is about 17675.4409280221. The cubic root of 312421212 is about 678.5473690792.

Adding to 312421212 its reverse (212124213), we get a palindrome (524545425).

It can be divided in two parts, 3124 and 21212, that added together give a square (24336 = 156²).

The spelling of 312421212 in words is "three hundred twelve million, four hundred twenty-one thousand, two hundred twelve".