121212120010221 has 12 divisors (see below), whose sum is σ = 179354519040060. Its totient is φ = 78837151225920.

The previous prime is 121212120010153. The next prime is 121212120010259. The reversal of 121212120010221 is 122010021212121.

121212120010221 is a `hidden beast` number, since 1 + 21 + 212 + 1 + 200 + 10 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1812550616100 + 119399569394121 = 1346310^2 + 10927011^2 .

It is not a de Polignac number, because 121212120010221 - 2³⁵ = 121177760271853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121212120010194 and 121212120010203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212120010291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164244064686 + ... + 164244065423.

It is an arithmetic number, because the mean of its divisors is an integer number (14946209920005).

Almost surely, 2^{121212120010221} is an apocalyptic number.

It is an amenable number.

121212120010221 is a deficient number, since it is larger than the sum of its proper divisors (58142399029839).

121212120010221 is a wasteful number, since it uses less digits than its factorization.

121212120010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328488130156 (or 328488130153 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121212120010221 its reverse (122010021212121), we get a palindrome (243222141222342).

The spelling of 121212120010221 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twenty million, ten thousand, two hundred twenty-one".