10021321021 has 4 divisors (see below), whose sum is σ = 10021682944. Its totient is φ = 10020959100.

The previous prime is 10021321001. The next prime is 10021321039. The reversal of 10021321021 is 12012312001.

10021321021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 10021321021 - 2¹¹ = 10021318973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021320992 and 10021321010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021321001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135645 + ... + 196066.

It is an arithmetic number, because the mean of its divisors is an integer number (2505420736).

Almost surely, 2^10021321021 is an apocalyptic number.

It is an amenable number.

10021321021 is a deficient number, since it is larger than the sum of its proper divisors (361923).

10021321021 is an equidigital number, since it uses as much as digits as its factorization.

10021321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361922.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 10021321021 its reverse (12012312001), we get a palindrome (22033633022).

The spelling of 10021321021 in words is "ten billion, twenty-one million, three hundred twenty-one thousand, twenty-one".