221102202001021 has 32 divisors (see below), whose sum is σ = 255822756658560. Its totient is φ = 188858640844800.

The previous prime is 221102202001019. The next prime is 221102202001033. The reversal of 221102202001021 is 120100202201122.

It is a happy number.

It is not a de Polignac number, because 221102202001021 - 2¹ = 221102202001019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221102202000986 and 221102202001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102202001001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262558281 + ... + 263399041.

It is an arithmetic number, because the mean of its divisors is an integer number (7994461145580).

Almost surely, 2^{221102202001021} is an apocalyptic number.

It is an amenable number.

221102202001021 is a deficient number, since it is larger than the sum of its proper divisors (34720554657539).

221102202001021 is a wasteful number, since it uses less digits than its factorization.

221102202001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843165.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221102202001021 its reverse (120100202201122), we get a palindrome (341202404202143).

The spelling of 221102202001021 in words is "two hundred twenty-one trillion, one hundred two billion, two hundred two million, one thousand, twenty-one".