221020110212221 has 16 divisors (see below), whose sum is σ = 234621333302400. Its totient is φ = 207754051075648.

The previous prime is 221020110212207. The next prime is 221020110212249. The reversal of 221020110212221 is 122212011020122.

It is not a de Polignac number, because 221020110212221 - 2⁷ = 221020110212093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020110212201) 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, 24855526 + ... + 32555143.

It is an arithmetic number, because the mean of its divisors is an integer number (14663833331400).

Almost surely, 2^{221020110212221} is an apocalyptic number.

It is an amenable number.

221020110212221 is a deficient number, since it is larger than the sum of its proper divisors (13601223090179).

221020110212221 is a wasteful number, since it uses less digits than its factorization.

221020110212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57413588.

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

Adding to 221020110212221 its reverse (122212011020122), we get a palindrome (343232121232343).

The spelling of 221020110212221 in words is "two hundred twenty-one trillion, twenty billion, one hundred ten million, two hundred twelve thousand, two hundred twenty-one".