121212001100221 has 4 divisors (see below), whose sum is σ = 121219197697312. Its totient is φ = 121204804503132.

The previous prime is 121212001100213. The next prime is 121212001100237. The reversal of 121212001100221 is 122001100212121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121212001100221 - 2³ = 121212001100213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212001100195 and 121212001100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212001100621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3598273281 + ... + 3598306966.

It is an arithmetic number, because the mean of its divisors is an integer number (30304799424328).

Almost surely, 2^{121212001100221} is an apocalyptic number.

It is an amenable number.

121212001100221 is a deficient number, since it is larger than the sum of its proper divisors (7196597091).

121212001100221 is an equidigital number, since it uses as much as digits as its factorization.

121212001100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7196597090.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121212001100221 its reverse (122001100212121), we get a palindrome (243213101312342).

The spelling of 121212001100221 in words is "one hundred twenty-one trillion, two hundred twelve billion, one million, one hundred thousand, two hundred twenty-one".