121200100222221 has 32 divisors (see below), whose sum is σ = 183837943303680. Its totient is φ = 78881719866048.

The previous prime is 121200100222219. The next prime is 121200100222241. The reversal of 121200100222221 is 122222001002121.

It is a happy number.

121200100222221 is a `hidden beast` number, since 1 + 2 + 120 + 0 + 100 + 222 + 221 = 666.

It is not a de Polignac number, because 121200100222221 - 2¹ = 121200100222219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121200100222194 and 121200100222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200100222241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119783806 + ... + 120791391.

It is an arithmetic number, because the mean of its divisors is an integer number (5744935728240).

Almost surely, 2^{121200100222221} is an apocalyptic number.

It is an amenable number.

121200100222221 is a deficient number, since it is larger than the sum of its proper divisors (62637843081459).

121200100222221 is a wasteful number, since it uses less digits than its factorization.

121200100222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240575650 (or 240575644 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121200100222221 its reverse (122222001002121), we get a palindrome (243422101224342).

The spelling of 121200100222221 in words is "one hundred twenty-one trillion, two hundred billion, one hundred million, two hundred twenty-two thousand, two hundred twenty-one".