31122423421 has 4 divisors (see below), whose sum is σ = 31131941344. Its totient is φ = 31112905500.

The previous prime is 31122423403. The next prime is 31122423463. The reversal of 31122423421 is 12432422113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12432422113 = 67 ⋅185558539.

It is a cyclic number.

It is not a de Polignac number, because 31122423421 - 2⁹ = 31122422909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122426421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4754055 + ... + 4760596.

It is an arithmetic number, because the mean of its divisors is an integer number (7782985336).

Almost surely, 2^31122423421 is an apocalyptic number.

It is an amenable number.

31122423421 is a deficient number, since it is larger than the sum of its proper divisors (9517923).

31122423421 is an equidigital number, since it uses as much as digits as its factorization.

31122423421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9517922.

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

Adding to 31122423421 its reverse (12432422113), we get a palindrome (43554845534).

The spelling of 31122423421 in words is "thirty-one billion, one hundred twenty-two million, four hundred twenty-three thousand, four hundred twenty-one".