31221231002 has 8 divisors (see below), whose sum is σ = 50434296276. Its totient is φ = 14409798912.

The previous prime is 31221231001. The next prime is 31221231011. The reversal of 31221231002 is 20013212213.

It can be written as a sum of positive squares in 2 ways, for example, as 25405490881 + 5815740121 = 159391^2 + 76261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31221231001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600408263 + ... + 600408314.

Almost surely, 2^31221231002 is an apocalyptic number.

31221231002 is a deficient number, since it is larger than the sum of its proper divisors (19213065274).

31221231002 is a wasteful number, since it uses less digits than its factorization.

31221231002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200816592.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31221231002 its reverse (20013212213), we get a palindrome (51234443215).

The spelling of 31221231002 in words is "thirty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, two".