312011021 has 8 divisors (see below), whose sum is σ = 357116160. Its totient is φ = 267038928.

The previous prime is 312011017. The next prime is 312011023. The reversal of 312011021 is 120110213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 312011021 - 2² = 312011017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312010993 and 312011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28181 + ... + 37658.

It is an arithmetic number, because the mean of its divisors is an integer number (44639520).

Almost surely, 2^312011021 is an apocalyptic number.

It is an amenable number.

312011021 is a deficient number, since it is larger than the sum of its proper divisors (45105139).

312011021 is an equidigital number, since it uses as much as digits as its factorization.

312011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66523.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 312011021 is about 17663.8337005306. The cubic root of 312011021 is about 678.2502745219.

Adding to 312011021 its reverse (120110213), we get a palindrome (432121234).

It can be divided in two parts, 3120 and 11021, that added together give a palindrome (14141).

The spelling of 312011021 in words is "three hundred twelve million, eleven thousand, twenty-one".