121000121212221 has 12 divisors (see below), whose sum is σ = 181251210375872. Its totient is φ = 80666747474652.

The previous prime is 121000121212207. The next prime is 121000121212259. The reversal of 121000121212221 is 122212121000121.

121000121212221 is a `hidden beast` number, since 1 + 210 + 0 + 0 + 1 + 21 + 212 + 221 = 666.

It is not a de Polignac number, because 121000121212221 - 2⁹ = 121000121211709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121000121212194 and 121000121212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000121202221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248971442581 + ... + 248971443066.

Almost surely, 2^{121000121212221} is an apocalyptic number.

It is an amenable number.

121000121212221 is a deficient number, since it is larger than the sum of its proper divisors (60251089163651).

121000121212221 is an frugal number, since it uses more digits than its factorization.

121000121212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497942885662 (or 497942885650 counting only the distinct ones).

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

Adding to 121000121212221 its reverse (122212121000121), we get a palindrome (243212242212342).

The spelling of 121000121212221 in words is "one hundred twenty-one trillion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".