312130021 has 16 divisors (see below), whose sum is σ = 361428480. Its totient is φ = 264029040.

The previous prime is 312130009. The next prime is 312130073. The reversal of 312130021 is 120031213.

It is a cyclic number.

It is not a de Polignac number, because 312130021 - 2¹³ = 312121829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312129983 and 312130010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312130121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247290 + ... + 248548.

It is an arithmetic number, because the mean of its divisors is an integer number (22589280).

Almost surely, 2^312130021 is an apocalyptic number.

It is an amenable number.

312130021 is a deficient number, since it is larger than the sum of its proper divisors (49298459).

312130021 is a wasteful number, since it uses less digits than its factorization.

312130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704.

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

The square root of 312130021 is about 17667.2018440952. The cubic root of 312130021 is about 678.3364910531.

Adding to 312130021 its reverse (120031213), we get a palindrome (432161234).

The spelling of 312130021 in words is "three hundred twelve million, one hundred thirty thousand, twenty-one".