221202220111021 has 16 divisors (see below), whose sum is σ = 231276325420800. Its totient is φ = 211303324230208.

The previous prime is 221202220111003. The next prime is 221202220111051. The reversal of 221202220111021 is 120111022202122.

221202220111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221202220111021 - 2¹⁵ = 221202220078253 is a prime.

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 221202220111021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221202220111051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107131285 + ... + 109176538.

It is an arithmetic number, because the mean of its divisors is an integer number (14454770338800).

Almost surely, 2^{221202220111021} is an apocalyptic number.

It is an amenable number.

221202220111021 is a deficient number, since it is larger than the sum of its proper divisors (10074105309779).

221202220111021 is a wasteful number, since it uses less digits than its factorization.

221202220111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216308228.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221202220111021 its reverse (120111022202122), we get a palindrome (341313242313143).

The spelling of 221202220111021 in words is "two hundred twenty-one trillion, two hundred two billion, two hundred twenty million, one hundred eleven thousand, twenty-one".