3121312321 has 8 divisors (see below), whose sum is σ = 3140268480. Its totient is φ = 3102373392.

The previous prime is 3121312307. The next prime is 3121312333. The reversal of 3121312321 is 1232131213.

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

It is a cyclic number.

It is not a de Polignac number, because 3121312321 - 2⁵ = 3121312289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121312351) 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, 646111 + ... + 650923.

It is an arithmetic number, because the mean of its divisors is an integer number (392533560).

Almost surely, 2^3121312321 is an apocalyptic number.

It is an amenable number.

3121312321 is a deficient number, since it is larger than the sum of its proper divisors (18956159).

3121312321 is a wasteful number, since it uses less digits than its factorization.

3121312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8615.

The product of its digits is 216, while the sum is 19.

The square root of 3121312321 is about 55868.7060974209. The cubic root of 3121312321 is about 1461.4335580106.

Adding to 3121312321 its reverse (1232131213), we get a palindrome (4353443534).

It can be divided in two parts, 31213 and 12321, that added together give a palindrome (43534).

The spelling of 3121312321 in words is "three billion, one hundred twenty-one million, three hundred twelve thousand, three hundred twenty-one".