12122112100221 has 20 divisors (see below), whose sum is σ = 18109688170464. Its totient is φ = 8080806537000.

The previous prime is 12122112100213. The next prime is 12122112100223. The reversal of 12122112100221 is 12200121122121.

12122112100221 is a `hidden beast` number, since 1 + 21 + 2 + 211 + 210 + 0 + 221 = 666.

It is not a de Polignac number, because 12122112100221 - 2³ = 12122112100213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12122112100194 and 12122112100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122112100223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4473465 + ... + 6652526.

Almost surely, 2^{12122112100221} is an apocalyptic number.

It is an amenable number.

12122112100221 is a deficient number, since it is larger than the sum of its proper divisors (5987576070243).

12122112100221 is a wasteful number, since it uses less digits than its factorization.

12122112100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11139454 (or 11139445 counting only the distinct ones).

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

Adding to 12122112100221 its reverse (12200121122121), we get a palindrome (24322233222342).

The spelling of 12122112100221 in words is "twelve trillion, one hundred twenty-two billion, one hundred twelve million, one hundred thousand, two hundred twenty-one".