312012021 has 8 divisors (see below), whose sum is σ = 416144800. Its totient is φ = 207943632.

The previous prime is 312012013. The next prime is 312012047. The reversal of 312012021 is 120210213.

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

It is not a de Polignac number, because 312012021 - 2³ = 312012013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 312011988 and 312012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312012821) 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, 3346 + ... + 25203.

It is an arithmetic number, because the mean of its divisors is an integer number (52018100).

Almost surely, 2^312012021 is an apocalyptic number.

It is an amenable number.

312012021 is a deficient number, since it is larger than the sum of its proper divisors (104132779).

312012021 is a wasteful number, since it uses less digits than its factorization.

312012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32195.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 312012021 is about 17663.8620069338. The cubic root of 312012021 is about 678.2509991219.

Adding to 312012021 its reverse (120210213), we get a palindrome (432222234).

The spelling of 312012021 in words is "three hundred twelve million, twelve thousand, twenty-one".