31221330112 has 28 divisors (see below), whose sum is σ = 70805517520. Its totient is φ = 13380569856.

The previous prime is 31221330103. The next prime is 31221330131. The reversal of 31221330112 is 21103312213.

It is a tau number, because it is divible by the number of its divisors (28).

It is a self number, because there is not a number n which added to its sum of digits gives 31221330112.

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, 34844787 + ... + 34845682.

Almost surely, 2^31221330112 is an apocalyptic number.

31221330112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31221330112 is an abundant number, since it is smaller than the sum of its proper divisors (39584187408).

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

31221330112 is an equidigital number, since it uses as much as digits as its factorization.

31221330112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69690488 (or 69690478 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31221330112 its reverse (21103312213), we get a palindrome (52324642325).

The spelling of 31221330112 in words is "thirty-one billion, two hundred twenty-one million, three hundred thirty thousand, one hundred twelve".