31440221343 has 6 divisors (see below), whose sum is σ = 45413653064. Its totient is φ = 20960147556.

The previous prime is 31440221317. The next prime is 31440221357. The reversal of 31440221343 is 34312204413.

31440221343 is a `hidden beast` number, since 3 + 1 + 4 + 402 + 213 + 43 = 666.

It is not a de Polignac number, because 31440221343 - 2¹⁶ = 31440155807 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 (31440221143) 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 5 ways as a sum of consecutive naturals, for example, 1746678955 + ... + 1746678972.

Almost surely, 2^31440221343 is an apocalyptic number.

31440221343 is a deficient number, since it is larger than the sum of its proper divisors (13973431721).

31440221343 is a wasteful number, since it uses less digits than its factorization.

31440221343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493357933 (or 3493357930 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31440221343 its reverse (34312204413), we get a palindrome (65752425756).

The spelling of 31440221343 in words is "thirty-one billion, four hundred forty million, two hundred twenty-one thousand, three hundred forty-three".