100221212321 has 4 divisors (see below), whose sum is σ = 100383121200. Its totient is φ = 100059303444.

The previous prime is 100221212297. The next prime is 100221212381. The reversal of 100221212321 is 123212122001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123212122001 = 28123 ⋅4381187.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100221212321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100221212321.

It is not an unprimeable number, because it can be changed into a prime (100221212381) 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 3 ways as a sum of consecutive naturals, for example, 80953511 + ... + 80954748.

It is an arithmetic number, because the mean of its divisors is an integer number (25095780300).

Almost surely, 2^100221212321 is an apocalyptic number.

It is an amenable number.

100221212321 is a deficient number, since it is larger than the sum of its proper divisors (161908879).

100221212321 is an equidigital number, since it uses as much as digits as its factorization.

100221212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161908878.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 100221212321 its reverse (123212122001), we get a palindrome (223433334322).

The spelling of 100221212321 in words is "one hundred billion, two hundred twenty-one million, two hundred twelve thousand, three hundred twenty-one".