1221020000121 has 8 divisors (see below), whose sum is σ = 1638396264064. Its totient is φ = 808828534800.

The previous prime is 1221020000119. The next prime is 1221020000143. The reversal of 1221020000121 is 1210000201221.

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

It is not a de Polignac number, because 1221020000121 - 2¹ = 1221020000119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221020000097 and 1221020000106.

It is not an unprimeable number, because it can be changed into a prime (1221020000111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296199105 + ... + 1296200046.

It is an arithmetic number, because the mean of its divisors is an integer number (204799533008).

Almost surely, 2^{1221020000121} is an apocalyptic number.

It is an amenable number.

1221020000121 is a deficient number, since it is larger than the sum of its proper divisors (417376263943).

1221020000121 is a wasteful number, since it uses less digits than its factorization.

1221020000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592399311.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221020000121 its reverse (1210000201221), we get a palindrome (2431020201342).

The spelling of 1221020000121 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred twenty-one", and thus it is an aban number.