31243133421 has 6 divisors (see below), whose sum is σ = 45128970510. Its totient is φ = 20828755608.

The previous prime is 31243133419. The next prime is 31243133437. The reversal of 31243133421 is 12433134213.

It is a happy number.

31243133421 is a `hidden beast` number, since 3 + 1 + 2 + 4 + 313 + 342 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25024076100 + 6219057321 = 158190^2 + 78861^2 .

It is not a de Polignac number, because 31243133421 - 2¹ = 31243133419 is a prime.

It is a super-2 number, since 2×31243133421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31243133401) 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 5 ways as a sum of consecutive naturals, for example, 1735729626 + ... + 1735729643.

It is an arithmetic number, because the mean of its divisors is an integer number (7521495085).

Almost surely, 2^31243133421 is an apocalyptic number.

It is an amenable number.

31243133421 is a deficient number, since it is larger than the sum of its proper divisors (13885837089).

31243133421 is a wasteful number, since it uses less digits than its factorization.

31243133421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3471459275 (or 3471459272 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 31243133421 its reverse (12433134213), we get a palindrome (43676267634).

The spelling of 31243133421 in words is "thirty-one billion, two hundred forty-three million, one hundred thirty-three thousand, four hundred twenty-one".