31321042040 has 16 divisors (see below), whose sum is σ = 70472344680. Its totient is φ = 12528416800.

The previous prime is 31321042001. The next prime is 31321042091. The reversal of 31321042040 is 4024012313.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 391512986 + ... + 391513065.

Almost surely, 2^31321042040 is an apocalyptic number.

It is an amenable number.

31321042040 is an abundant number, since it is smaller than the sum of its proper divisors (39151302640).

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

31321042040 is a wasteful number, since it uses less digits than its factorization.

31321042040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783026062 (or 783026058 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31321042040 its reverse (4024012313), we get a palindrome (35345054353).

The spelling of 31321042040 in words is "thirty-one billion, three hundred twenty-one million, forty-two thousand, forty".