312821012 has 24 divisors (see below), whose sum is σ = 662445504. Its totient is φ = 126179712.

The previous prime is 312820979. The next prime is 312821017. The reversal of 312821012 is 210128213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312821017) 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 in 7 ways as a sum of consecutive naturals, for example, 328118 + ... + 329069.

It is an arithmetic number, because the mean of its divisors is an integer number (27601896).

Almost surely, 2^312821012 is an apocalyptic number.

It is an amenable number.

312821012 is an abundant number, since it is smaller than the sum of its proper divisors (349624492).

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

312821012 is a wasteful number, since it uses less digits than its factorization.

312821012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657215 (or 657213 counting only the distinct ones).

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

The square root of 312821012 is about 17686.7467896162. The cubic root of 312821012 is about 678.8366874642.

Adding to 312821012 its reverse (210128213), we get a palindrome (522949225).

The spelling of 312821012 in words is "three hundred twelve million, eight hundred twenty-one thousand, twelve".