121220001221 has 8 divisors (see below), whose sum is σ = 132262557888. Its totient is φ = 110181204000.

The previous prime is 121220001211. The next prime is 121220001223. The reversal of 121220001221 is 122100022121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121220001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220001196 and 121220001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220001223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 872225 + ... + 1001606.

It is an arithmetic number, because the mean of its divisors is an integer number (16532819736).

Almost surely, 2^121220001221 is an apocalyptic number.

121220001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220001221 is a deficient number, since it is larger than the sum of its proper divisors (11042556667).

121220001221 is a wasteful number, since it uses less digits than its factorization.

121220001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879723.

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

Adding to 121220001221 its reverse (122100022121), we get a palindrome (243320023342).

The spelling of 121220001221 in words is "one hundred twenty-one billion, two hundred twenty million, one thousand, two hundred twenty-one".