121201210212221 has 4 divisors (see below), whose sum is σ = 122313147920700. Its totient is φ = 120089272503744.

The previous prime is 121201210212217. The next prime is 121201210212233. The reversal of 121201210212221 is 122212012102121.

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 29805430519225 + 91395779692996 = 5459435^2 + 9560114^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201210212221 - 2² = 121201210212217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201210212193 and 121201210212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201210214221) 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, 555968854076 + ... + 555968854293.

It is an arithmetic number, because the mean of its divisors is an integer number (30578286980175).

Almost surely, 2^{121201210212221} is an apocalyptic number.

It is an amenable number.

121201210212221 is a deficient number, since it is larger than the sum of its proper divisors (1111937708479).

121201210212221 is a wasteful number, since it uses less digits than its factorization.

121201210212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111937708478.

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

Adding to 121201210212221 its reverse (122212012102121), we get a palindrome (243413222314342).

The spelling of 121201210212221 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred ten million, two hundred twelve thousand, two hundred twenty-one".