3121421031 has 24 divisors (see below), whose sum is σ = 4659833984. Its totient is φ = 2011366080.

The previous prime is 3121421027. The next prime is 3121421063. The reversal of 3121421031 is 1301241213.

It is not a de Polignac number, because 3121421031 - 2² = 3121421027 is a prime.

It is a super-2 number, since 2×3121421031² = 19486538505538205922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3121420995 and 3121421013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121421531) 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 in 23 ways as a sum of consecutive naturals, for example, 238305 + ... + 251061.

Almost surely, 2^3121421031 is an apocalyptic number.

3121421031 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3121421031 is a deficient number, since it is larger than the sum of its proper divisors (1538412953).

3121421031 is a wasteful number, since it uses less digits than its factorization.

3121421031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13671 (or 13668 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 3121421031 is about 55869.6789949611. The cubic root of 3121421031 is about 1461.4505242288.

Adding to 3121421031 its reverse (1301241213), we get a palindrome (4422662244).

The spelling of 3121421031 in words is "three billion, one hundred twenty-one million, four hundred twenty-one thousand, thirty-one".