31243021340 has 12 divisors (see below), whose sum is σ = 65610344856. Its totient is φ = 12497208528.

The previous prime is 31243021321. The next prime is 31243021361. The reversal of 31243021340 is 4312034213.

It is a super-2 number, since 2×31243021340² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 781075514 + ... + 781075553.

It is an arithmetic number, because the mean of its divisors is an integer number (5467528738).

Almost surely, 2^31243021340 is an apocalyptic number.

It is an amenable number.

31243021340 is an abundant number, since it is smaller than the sum of its proper divisors (34367323516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31243021340 is a wasteful number, since it uses less digits than its factorization.

31243021340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562151076 (or 1562151074 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31243021340 its reverse (4312034213), we get a palindrome (35555055553).

The spelling of 31243021340 in words is "thirty-one billion, two hundred forty-three million, twenty-one thousand, three hundred forty".