121110001221 has 24 divisors (see below), whose sum is σ = 185211714240. Its totient is φ = 70208691520.

The previous prime is 121110001219. The next prime is 121110001283. The reversal of 121110001221 is 122100011121.

It is not a de Polignac number, because 121110001221 - 2¹ = 121110001219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121110001197 and 121110001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110001321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7244616 + ... + 7261313.

It is an arithmetic number, because the mean of its divisors is an integer number (7717154760).

Almost surely, 2^121110001221 is an apocalyptic number.

121110001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121110001221 is a deficient number, since it is larger than the sum of its proper divisors (64101713019).

121110001221 is a wasteful number, since it uses less digits than its factorization.

121110001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14505977 (or 14505966 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121110001221 its reverse (122100011121), we get a palindrome (243210012342).

The spelling of 121110001221 in words is "one hundred twenty-one billion, one hundred ten million, one thousand, two hundred twenty-one".