121020112122221 has 4 divisors (see below), whose sum is σ = 130329351516252. Its totient is φ = 111710872728192.

The previous prime is 121020112122193. The next prime is 121020112122223. The reversal of 121020112122221 is 122221211020121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65693456522500 + 55326655599721 = 8105150^2 + 7438189^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020112122221 - 2⁶ = 121020112122157 is a prime.

It is a super-3 number, since 3×121020112122221³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020112122193 and 121020112122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020112122223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4654619696996 + ... + 4654619697021.

It is an arithmetic number, because the mean of its divisors is an integer number (32582337879063).

Almost surely, 2^{121020112122221} is an apocalyptic number.

It is an amenable number.

121020112122221 is a deficient number, since it is larger than the sum of its proper divisors (9309239394031).

121020112122221 is an equidigital number, since it uses as much as digits as its factorization.

121020112122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309239394030.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121020112122221 its reverse (122221211020121), we get a palindrome (243241323142342).

The spelling of 121020112122221 in words is "one hundred twenty-one trillion, twenty billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".