221102121020221 has 16 divisors (see below), whose sum is σ = 257610282367104. Its totient is φ = 185828785781184.

The previous prime is 221102121020219. The next prime is 221102121020251. The reversal of 221102121020221 is 122020121201122.

It is not a de Polignac number, because 221102121020221 - 2¹ = 221102121020219 is a prime.

It is a super-2 number, since 2×221102121020221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102121020251) 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, 178134570 + ... + 179371483.

It is an arithmetic number, because the mean of its divisors is an integer number (16100642647944).

Almost surely, 2^{221102121020221} is an apocalyptic number.

It is an amenable number.

221102121020221 is a deficient number, since it is larger than the sum of its proper divisors (36508161346883).

221102121020221 is a wasteful number, since it uses less digits than its factorization.

221102121020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357507780.

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

Adding to 221102121020221 its reverse (122020121201122), we get a palindrome (343122242221343).

The spelling of 221102121020221 in words is "two hundred twenty-one trillion, one hundred two billion, one hundred twenty-one million, twenty thousand, two hundred twenty-one".