221222202021121 has 16 divisors (see below), whose sum is σ = 260113940063104. Its totient is φ = 184230143501184.

The previous prime is 221222202021109. The next prime is 221222202021127. The reversal of 221222202021121 is 121120202222122.

It is a cyclic number.

It is not a de Polignac number, because 221222202021121 - 2⁹ = 221222202020609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221222202021092 and 221222202021101.

It is not an unprimeable number, because it can be changed into a prime (221222202021127) 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, 3230713230 + ... + 3230781703.

It is an arithmetic number, because the mean of its divisors is an integer number (16257121253944).

Almost surely, 2^{221222202021121} is an apocalyptic number.

It is an amenable number.

221222202021121 is a deficient number, since it is larger than the sum of its proper divisors (38891738041983).

221222202021121 is an equidigital number, since it uses as much as digits as its factorization.

221222202021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461495080.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221222202021121 its reverse (121120202222122), we get a palindrome (342342404243243).

The spelling of 221222202021121 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred two million, twenty-one thousand, one hundred twenty-one".