312121200321 has 12 divisors (see below), whose sum is σ = 515247695872. Its totient is φ = 178354971576.

The previous prime is 312121200317. The next prime is 312121200337. The reversal of 312121200321 is 123002121213.

312121200321 is a `hidden beast` number, since 3 + 121 + 21 + 200 + 321 = 666.

It is not a de Polignac number, because 312121200321 - 2² = 312121200317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312121200294 and 312121200303.

It is not an unprimeable number, because it can be changed into a prime (312121200361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2477152321 + ... + 2477152446.

Almost surely, 2^312121200321 is an apocalyptic number.

It is an amenable number.

312121200321 is a deficient number, since it is larger than the sum of its proper divisors (203126495551).

312121200321 is a wasteful number, since it uses less digits than its factorization.

312121200321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954304780 (or 4954304777 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 312121200321 its reverse (123002121213), we get a palindrome (435123321534).

The spelling of 312121200321 in words is "three hundred twelve billion, one hundred twenty-one million, two hundred thousand, three hundred twenty-one".