221002002000221 has 4 divisors (see below), whose sum is σ = 238002156000252. Its totient is φ = 204001848000192.

The previous prime is 221002002000191. The next prime is 221002002000259. The reversal of 221002002000221 is 122000200200122.

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 14420626502500 + 206581375497721 = 3797450^2 + 14372939^2 .

It is a cyclic number.

It is not a de Polignac number, because 221002002000221 - 2²⁶ = 221001934891357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221002002000196 and 221002002000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002002000721) 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, 8500076999996 + ... + 8500077000021.

It is an arithmetic number, because the mean of its divisors is an integer number (59500539000063).

Almost surely, 2^{221002002000221} is an apocalyptic number.

It is an amenable number.

221002002000221 is a deficient number, since it is larger than the sum of its proper divisors (17000154000031).

221002002000221 is a wasteful number, since it uses less digits than its factorization.

221002002000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17000154000030.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221002002000221 its reverse (122000200200122), we get a palindrome (343002202200343).

The spelling of 221002002000221 in words is "two hundred twenty-one trillion, two billion, two million, two hundred twenty-one", and thus it is an aban number.