3121343421 has 16 divisors (see below), whose sum is σ = 4884883584. Its totient is φ = 1735418304.

The previous prime is 3121343413. The next prime is 3121343437. The reversal of 3121343421 is 1243431213.

It is a happy number.

It is not a de Polignac number, because 3121343421 - 2³ = 3121343413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3121343391 and 3121343400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121343471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2007810 + ... + 2009363.

It is an arithmetic number, because the mean of its divisors is an integer number (305305224).

Almost surely, 2^3121343421 is an apocalyptic number.

It is an amenable number.

3121343421 is a deficient number, since it is larger than the sum of its proper divisors (1763540163).

3121343421 is a wasteful number, since it uses less digits than its factorization.

3121343421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017220.

The product of its digits is 1728, while the sum is 24.

The square root of 3121343421 is about 55868.9844278559. The cubic root of 3121343421 is about 1461.4384117845.

Adding to 3121343421 its reverse (1243431213), we get a palindrome (4364774634).

The spelling of 3121343421 in words is "three billion, one hundred twenty-one million, three hundred forty-three thousand, four hundred twenty-one".