31821312006 has 24 divisors (see below), whose sum is σ = 75214010664. Its totient is φ = 9642821760.

The previous prime is 31821311993. The next prime is 31821312041. The reversal of 31821312006 is 60021312813.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80356651 + ... + 80357046.

It is an arithmetic number, because the mean of its divisors is an integer number (3133917111).

Almost surely, 2^31821312006 is an apocalyptic number.

31821312006 is an abundant number, since it is smaller than the sum of its proper divisors (43392698658).

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

31821312006 is a wasteful number, since it uses less digits than its factorization.

31821312006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160713716 (or 160713713 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 31821312006 its reverse (60021312813), we get a palindrome (91842624819).

The spelling of 31821312006 in words is "thirty-one billion, eight hundred twenty-one million, three hundred twelve thousand, six".