31221220202 has 8 divisors (see below), whose sum is σ = 47599565412. Its totient is φ = 15354698400.

The previous prime is 31221220181. The next prime is 31221220237. The reversal of 31221220202 is 20202212213.

It can be written as a sum of positive squares in 2 ways, for example, as 19782703801 + 11438516401 = 140651^2 + 106951^2 .

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

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, 127955699 + ... + 127955942.

Almost surely, 2^31221220202 is an apocalyptic number.

31221220202 is a deficient number, since it is larger than the sum of its proper divisors (16378345210).

31221220202 is a wasteful number, since it uses less digits than its factorization.

31221220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255911704.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 31221220202 its reverse (20202212213), we get a palindrome (51423432415).

The spelling of 31221220202 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred two".