121200120221 has 4 divisors (see below), whose sum is σ = 124018727712. Its totient is φ = 118381512732.

The previous prime is 121200120211. The next prime is 121200120227. The reversal of 121200120221 is 122021002121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122021002121 = 73 ⋅1671520577.

It is a cyclic number.

It is not a de Polignac number, because 121200120221 - 2⁶ = 121200120157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200120196 and 121200120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200120227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1409303681 + ... + 1409303766.

It is an arithmetic number, because the mean of its divisors is an integer number (31004681928).

Almost surely, 2^121200120221 is an apocalyptic number.

It is an amenable number.

121200120221 is a deficient number, since it is larger than the sum of its proper divisors (2818607491).

121200120221 is an equidigital number, since it uses as much as digits as its factorization.

121200120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818607490.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121200120221 its reverse (122021002121), we get a palindrome (243221122342).

The spelling of 121200120221 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty thousand, two hundred twenty-one".