100021232313221 has 4 divisors (see below), whose sum is σ = 100022015882700. Its totient is φ = 100020448743744.

The previous prime is 100021232313199. The next prime is 100021232313241. The reversal of 100021232313221 is 122313232120001.

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 26250139533121 + 73771092780100 = 5123489^2 + 8589010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100021232313221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021232313241) 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, 391593236 + ... + 391848573.

It is an arithmetic number, because the mean of its divisors is an integer number (25005503970675).

Almost surely, 2^{100021232313221} is an apocalyptic number.

It is an amenable number.

100021232313221 is a deficient number, since it is larger than the sum of its proper divisors (783569479).

100021232313221 is an equidigital number, since it uses as much as digits as its factorization.

100021232313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783569478.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 100021232313221 its reverse (122313232120001), we get a palindrome (222334464433222).

The spelling of 100021232313221 in words is "one hundred trillion, twenty-one billion, two hundred thirty-two million, three hundred thirteen thousand, two hundred twenty-one".