221222112210021 has 16 divisors (see below), whose sum is σ = 318654321318144. Its totient is φ = 135707231166144.

The previous prime is 221222112210007. The next prime is 221222112210061. The reversal of 221222112210021 is 120012211222122.

It is not a de Polignac number, because 221222112210021 - 2¹¹ = 221222112207973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221222112210021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222112210061) 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, 8946930621 + ... + 8946955346.

It is an arithmetic number, because the mean of its divisors is an integer number (19915895082384).

Almost surely, 2^{221222112210021} is an apocalyptic number.

It is an amenable number.

221222112210021 is a deficient number, since it is larger than the sum of its proper divisors (97432209108123).

221222112210021 is a wasteful number, since it uses less digits than its factorization.

221222112210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17893886300.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221222112210021 its reverse (120012211222122), we get a palindrome (341234323432143).

The spelling of 221222112210021 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, two hundred ten thousand, twenty-one".