31431113421 has 4 divisors (see below), whose sum is σ = 41908151232. Its totient is φ = 20954075612.

The previous prime is 31431113407. The next prime is 31431113447. The reversal of 31431113421 is 12431113413.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 31431113421 - 2¹⁰ = 31431112397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31431113391 and 31431113400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431113521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5238518901 + ... + 5238518906.

It is an arithmetic number, because the mean of its divisors is an integer number (10477037808).

Almost surely, 2^31431113421 is an apocalyptic number.

It is an amenable number.

31431113421 is a deficient number, since it is larger than the sum of its proper divisors (10477037811).

31431113421 is a wasteful number, since it uses less digits than its factorization.

31431113421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10477037810.

The product of its digits is 864, while the sum is 24.

Adding to 31431113421 its reverse (12431113413), we get a palindrome (43862226834).

The spelling of 31431113421 in words is "thirty-one billion, four hundred thirty-one million, one hundred thirteen thousand, four hundred twenty-one".