121121022222221 has 8 divisors (see below), whose sum is σ = 138439718022144. Its totient is φ = 103806249578640.

The previous prime is 121121022222203. The next prime is 121121022222271. The reversal of 121121022222221 is 122222220121121.

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

It is not a de Polignac number, because 121121022222221 - 2¹⁸ = 121121021960077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121022222271) 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, 980722925 + ... + 980846418.

It is an arithmetic number, because the mean of its divisors is an integer number (17304964752768).

Almost surely, 2^{121121022222221} is an apocalyptic number.

It is an amenable number.

121121022222221 is a deficient number, since it is larger than the sum of its proper divisors (17318695799923).

121121022222221 is an equidigital number, since it uses as much as digits as its factorization.

121121022222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961578171.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 121121022222221 its reverse (122222220121121), we get a palindrome (243343242343342).

The spelling of 121121022222221 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".