100031220321 has 4 divisors (see below), whose sum is σ = 133374960432. Its totient is φ = 66687480212.

The previous prime is 100031220283. The next prime is 100031220323. The reversal of 100031220321 is 123022130001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100031220321 - 2⁶ = 100031220257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100031220321.

It is not an unprimeable number, because it can be changed into a prime (100031220323) by changing a digit.

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, 16671870051 + ... + 16671870056.

It is an arithmetic number, because the mean of its divisors is an integer number (33343740108).

Almost surely, 2^100031220321 is an apocalyptic number.

It is an amenable number.

100031220321 is a deficient number, since it is larger than the sum of its proper divisors (33343740111).

100031220321 is an equidigital number, since it uses as much as digits as its factorization.

100031220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33343740110.

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

Adding to 100031220321 its reverse (123022130001), we get a palindrome (223053350322).

The spelling of 100031220321 in words is "one hundred billion, thirty-one million, two hundred twenty thousand, three hundred twenty-one".