10021504550221 has 4 divisors (see below), whose sum is σ = 10021537980252. Its totient is φ = 10021471120192.

The previous prime is 10021504550219. The next prime is 10021504550227. The reversal of 10021504550221 is 12205540512001.

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 5616018394596 + 4405486155625 = 2369814^2 + 2098925^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021504550221 - 2¹ = 10021504550219 is a prime.

It is a super-2 number, since 2×10021504550221² (a number of 27 digits) contains 22 as substring.

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 10021504550221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021504550227) 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, 16261246 + ... + 16866271.

It is an arithmetic number, because the mean of its divisors is an integer number (2505384495063).

Almost surely, 2^{10021504550221} is an apocalyptic number.

It is an amenable number.

10021504550221 is a deficient number, since it is larger than the sum of its proper divisors (33430031).

10021504550221 is an equidigital number, since it uses as much as digits as its factorization.

10021504550221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33430030.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 10021504550221 in words is "ten trillion, twenty-one billion, five hundred four million, five hundred fifty thousand, two hundred twenty-one".