312120202321 has 4 divisors (see below), whose sum is σ = 314035050352. Its totient is φ = 310205354292.

The previous prime is 312120202319. The next prime is 312120202357. The reversal of 312120202321 is 123202021213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123202021213 = 107 ⋅1151420759.

It is a cyclic number.

It is not a de Polignac number, because 312120202321 - 2¹ = 312120202319 is a prime.

It is a super-3 number, since 3×312120202321³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312120202021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 957423771 + ... + 957424096.

It is an arithmetic number, because the mean of its divisors is an integer number (78508762588).

Almost surely, 2^312120202321 is an apocalyptic number.

It is an amenable number.

312120202321 is a deficient number, since it is larger than the sum of its proper divisors (1914848031).

312120202321 is a wasteful number, since it uses less digits than its factorization.

312120202321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914848030.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 312120202321 its reverse (123202021213), we get a palindrome (435322223534).

The spelling of 312120202321 in words is "three hundred twelve billion, one hundred twenty million, two hundred two thousand, three hundred twenty-one".