221112233212121 has 8 divisors (see below), whose sum is σ = 221739217075560. Its totient is φ = 220485252759552.

The previous prime is 221112233212111. The next prime is 221112233212177. The reversal of 221112233212121 is 121212332211122.

221112233212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 57289231171225 + 163823002040896 = 7568965^2 + 12799336^2 .

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 221112233212121 - 2²² = 221112229017817 is a prime.

It is a super-3 number, since 3×221112233212121³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221112233212111) 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, 188485241 + ... + 189654713.

It is an arithmetic number, because the mean of its divisors is an integer number (27717402134445).

Almost surely, 2^{221112233212121} is an apocalyptic number.

It is an amenable number.

221112233212121 is a deficient number, since it is larger than the sum of its proper divisors (626983863439).

221112233212121 is a wasteful number, since it uses less digits than its factorization.

221112233212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705435.

The product of its digits is 1152, while the sum is 26.

Adding to 221112233212121 its reverse (121212332211122), we get a palindrome (342324565423243).

The spelling of 221112233212121 in words is "two hundred twenty-one trillion, one hundred twelve billion, two hundred thirty-three million, two hundred twelve thousand, one hundred twenty-one".