3121443421 has 2 divisors, whose sum is σ = 3121443422. Its totient is φ = 3121443420.

The previous prime is 3121443407. The next prime is 3121443431. The reversal of 3121443421 is 1243441213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1632564025 + 1488879396 = 40405^2 + 38586^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121443421 - 2³¹ = 973959773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121443431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560721710 + 1560721711.

It is an arithmetic number, because the mean of its divisors is an integer number (1560721711).

Almost surely, 2^3121443421 is an apocalyptic number.

It is an amenable number.

3121443421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121443421 is an equidigital number, since it uses as much as digits as its factorization.

3121443421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 25.

The square root of 3121443421 is about 55869.8793716256. The cubic root of 3121443421 is about 1461.4540185559.

Adding to 3121443421 its reverse (1243441213), we get a palindrome (4364884634).

The spelling of 3121443421 in words is "three billion, one hundred twenty-one million, four hundred forty-three thousand, four hundred twenty-one".