3121402321 has 2 divisors, whose sum is σ = 3121402322. Its totient is φ = 3121402320.

The previous prime is 3121402313. The next prime is 3121402343. The reversal of 3121402321 is 1232041213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2346336721 + 775065600 = 48439^2 + 27840^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121402321 - 2³ = 3121402313 is a prime.

It is not a weakly prime, because it can be changed into another prime (3121402721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560701160 + 1560701161.

It is an arithmetic number, because the mean of its divisors is an integer number (1560701161).

Almost surely, 2^3121402321 is an apocalyptic number.

It is an amenable number.

3121402321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121402321 is an equidigital number, since it uses as much as digits as its factorization.

3121402321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 3121402321 is about 55869.5115514714. The cubic root of 3121402321 is about 1461.4476042132.

Adding to 3121402321 its reverse (1232041213), we get a palindrome (4353443534).

The spelling of 3121402321 in words is "three billion, one hundred twenty-one million, four hundred two thousand, three hundred twenty-one".