121200011122221 has 16 divisors (see below), whose sum is σ = 181333349977920. Its totient is φ = 80000007339600.

The previous prime is 121200011122193. The next prime is 121200011122279. The reversal of 121200011122221 is 122221110002121.

121200011122221 is a `hidden beast` number, since 121 + 200 + 0 + 1 + 1 + 122 + 221 = 666.

121200011122221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 121200011122221 - 2¹¹ = 121200011120173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121200011122194 and 121200011122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200011124221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22222221535 + ... + 22222226988.

It is an arithmetic number, because the mean of its divisors is an integer number (11333334373620).

Almost surely, 2^{121200011122221} is an apocalyptic number.

It is an amenable number.

121200011122221 is a deficient number, since it is larger than the sum of its proper divisors (60133338855699).

121200011122221 is a wasteful number, since it uses less digits than its factorization.

121200011122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44444448633 (or 44444448627 counting only the distinct ones).

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

Adding to 121200011122221 its reverse (122221110002121), we get a palindrome (243421121124342).

The spelling of 121200011122221 in words is "one hundred twenty-one trillion, two hundred billion, eleven million, one hundred twenty-two thousand, two hundred twenty-one".