100031212211321 has 4 divisors (see below), whose sum is σ = 100668353690532. Its totient is φ = 99394070732112.

The previous prime is 100031212211317. The next prime is 100031212211323. The reversal of 100031212211321 is 123112212130001.

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 30441647586025 + 69589564625296 = 5517395^2 + 8342036^2 .

It is a cyclic number.

It is not a de Polignac number, because 100031212211321 - 2² = 100031212211317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100031212211293 and 100031212211302.

It is not an unprimeable number, because it can be changed into a prime (100031212211323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318570739370 + ... + 318570739683.

It is an arithmetic number, because the mean of its divisors is an integer number (25167088422633).

Almost surely, 2^{100031212211321} is an apocalyptic number.

It is an amenable number.

100031212211321 is a deficient number, since it is larger than the sum of its proper divisors (637141479211).

100031212211321 is an equidigital number, since it uses as much as digits as its factorization.

100031212211321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637141479210.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 100031212211321 its reverse (123112212130001), we get a palindrome (223143424341322).

The spelling of 100031212211321 in words is "one hundred trillion, thirty-one billion, two hundred twelve million, two hundred eleven thousand, three hundred twenty-one".