312310021 has 8 divisors (see below), whose sum is σ = 315131904. Its totient is φ = 309500880.

The previous prime is 312309983. The next prime is 312310051. The reversal of 312310021 is 120013213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312310021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312309983 and 312310010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312310051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49956 + ... + 55858.

It is an arithmetic number, because the mean of its divisors is an integer number (39391488).

Almost surely, 2^312310021 is an apocalyptic number.

It is an amenable number.

312310021 is a deficient number, since it is larger than the sum of its proper divisors (2821883).

312310021 is a wasteful number, since it uses less digits than its factorization.

312310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6371.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 312310021 is about 17672.2952951788. The cubic root of 312310021 is about 678.4668609808.

Adding to 312310021 its reverse (120013213), we get a palindrome (432323234).

The spelling of 312310021 in words is "three hundred twelve million, three hundred ten thousand, twenty-one".