100321213021 has 4 divisors (see below), whose sum is σ = 100326430044. Its totient is φ = 100315996000.

The previous prime is 100321213019. The next prime is 100321213039. The reversal of 100321213021 is 120312123001.

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 72293765625 + 28027447396 = 268875^2 + 167414^2 .

It is a cyclic number.

It is not a de Polignac number, because 100321213021 - 2¹ = 100321213019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100321212986 and 100321213004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100321213051) 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, 2579560 + ... + 2618161.

It is an arithmetic number, because the mean of its divisors is an integer number (25081607511).

Almost surely, 2^100321213021 is an apocalyptic number.

It is an amenable number.

100321213021 is a deficient number, since it is larger than the sum of its proper divisors (5217023).

100321213021 is an equidigital number, since it uses as much as digits as its factorization.

100321213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5217022.

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

Adding to 100321213021 its reverse (120312123001), we get a palindrome (220633336022).

The spelling of 100321213021 in words is "one hundred billion, three hundred twenty-one million, two hundred thirteen thousand, twenty-one".