221212211121121 has 8 divisors (see below), whose sum is σ = 241322729815584. Its totient is φ = 201101745373920.

The previous prime is 221212211121103. The next prime is 221212211121149. The reversal of 221212211121121 is 121121112212122.

221212211121121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221212211121121 - 2¹¹ = 221212211119073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221212211121092 and 221212211121101.

It is not an unprimeable number, because it can be changed into a prime (221212211181121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4234875 + ... + 21455968.

It is an arithmetic number, because the mean of its divisors is an integer number (30165341226948).

Almost surely, 2^{221212211121121} is an apocalyptic number.

It is an amenable number.

221212211121121 is a deficient number, since it is larger than the sum of its proper divisors (20110518694463).

221212211121121 is a wasteful number, since it uses less digits than its factorization.

221212211121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26473631.

The product of its digits is 128, while the sum is 22.

Adding to 221212211121121 its reverse (121121112212122), we get a palindrome (342333323333243).

The spelling of 221212211121121 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".