31031221002 has 16 divisors (see below), whose sum is σ = 65328886560. Its totient is φ = 9799332912.

The previous prime is 31031220971. The next prime is 31031221003. The reversal of 31031221002 is 20012213013.

It is not an unprimeable number, because it can be changed into a prime (31031221003) 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 7 ways as a sum of consecutive naturals, for example, 136101733 + ... + 136101960.

It is an arithmetic number, because the mean of its divisors is an integer number (4083055410).

Almost surely, 2^31031221002 is an apocalyptic number.

31031221002 is an abundant number, since it is smaller than the sum of its proper divisors (34297665558).

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

31031221002 is a wasteful number, since it uses less digits than its factorization.

31031221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272203717.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31031221002 its reverse (20012213013), we get a palindrome (51043434015).

The spelling of 31031221002 in words is "thirty-one billion, thirty-one million, two hundred twenty-one thousand, two".