221010120102221 has 4 divisors (see below), whose sum is σ = 221149734835392. Its totient is φ = 220870505369052.

The previous prime is 221010120102151. The next prime is 221010120102259. The reversal of 221010120102221 is 122201021010122.

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 221010120102221 - 2²⁶ = 221010052993357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221010120102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010120302221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69807364211 + ... + 69807367376.

It is an arithmetic number, because the mean of its divisors is an integer number (55287433708848).

Almost surely, 2^{221010120102221} is an apocalyptic number.

It is an amenable number.

221010120102221 is a deficient number, since it is larger than the sum of its proper divisors (139614733171).

221010120102221 is a wasteful number, since it uses less digits than its factorization.

221010120102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139614733170.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221010120102221 its reverse (122201021010122), we get a palindrome (343211141112343).

The spelling of 221010120102221 in words is "two hundred twenty-one trillion, ten billion, one hundred twenty million, one hundred two thousand, two hundred twenty-one".