100203213221 has 4 divisors (see below), whose sum is σ = 100204052844. Its totient is φ = 100202373600.

The previous prime is 100203213217. The next prime is 100203213259. The reversal of 100203213221 is 122312302001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8203830625 + 91999382596 = 90575^2 + 303314^2 .

It is a cyclic number.

It is not a de Polignac number, because 100203213221 - 2² = 100203213217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 100203213221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100203213421) 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, 203720 + ... + 491841.

It is an arithmetic number, because the mean of its divisors is an integer number (25051013211).

Almost surely, 2^100203213221 is an apocalyptic number.

It is an amenable number.

100203213221 is a deficient number, since it is larger than the sum of its proper divisors (839623).

100203213221 is an equidigital number, since it uses as much as digits as its factorization.

100203213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839622.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 100203213221 its reverse (122312302001), we get a palindrome (222515515222).

The spelling of 100203213221 in words is "one hundred billion, two hundred three million, two hundred thirteen thousand, two hundred twenty-one".