121100202112221 has 16 divisors (see below), whose sum is σ = 179409758673600. Its totient is φ = 80732544746544.

The previous prime is 121100202112217. The next prime is 121100202112231. The reversal of 121100202112221 is 122211202001121.

121100202112221 is a `hidden beast` number, since 1 + 211 + 0 + 0 + 20 + 211 + 2 + 221 = 666.

It is not a de Polignac number, because 121100202112221 - 2² = 121100202112217 is a prime.

It is a super-3 number, since 3×121100202112221³ (a number of 43 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121100202112194 and 121100202112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100202112231) 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, 23239366 + ... + 27969063.

It is an arithmetic number, because the mean of its divisors is an integer number (11213109917100).

Almost surely, 2^{121100202112221} is an apocalyptic number.

It is an amenable number.

121100202112221 is a deficient number, since it is larger than the sum of its proper divisors (58309556561379).

121100202112221 is an equidigital number, since it uses as much as digits as its factorization.

121100202112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51296025 (or 51296019 counting only the distinct ones).

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

Adding to 121100202112221 its reverse (122211202001121), we get a palindrome (243311404113342).

It can be divided in two parts, 12110020 and 2112221, that added together give a palindrome (14222241).

The spelling of 121100202112221 in words is "one hundred twenty-one trillion, one hundred billion, two hundred two million, one hundred twelve thousand, two hundred twenty-one".