100031212321 has 4 divisors (see below), whose sum is σ = 103480564500. Its totient is φ = 96581860144.

The previous prime is 100031212277. The next prime is 100031212327. The reversal of 100031212321 is 123212130001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20597990400 + 79433221921 = 143520^2 + 281839^2 .

It is a cyclic number.

It is not a de Polignac number, because 100031212321 - 2¹¹ = 100031210273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100031212295 and 100031212304.

It is not an unprimeable number, because it can be changed into a prime (100031212327) 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, 1724676046 + ... + 1724676103.

It is an arithmetic number, because the mean of its divisors is an integer number (25870141125).

Almost surely, 2^100031212321 is an apocalyptic number.

It is an amenable number.

100031212321 is a deficient number, since it is larger than the sum of its proper divisors (3449352179).

100031212321 is an equidigital number, since it uses as much as digits as its factorization.

100031212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449352178.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 100031212321 its reverse (123212130001), we get a palindrome (223243342322).

The spelling of 100031212321 in words is "one hundred billion, thirty-one million, two hundred twelve thousand, three hundred twenty-one".