1221011000121 has 24 divisors (see below), whose sum is σ = 1791853850752. Its totient is φ = 739021140000.

The previous prime is 1221011000113. The next prime is 1221011000161. The reversal of 1221011000121 is 1210001101221.

It is not a de Polignac number, because 1221011000121 - 2³ = 1221011000113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221011000097 and 1221011000106.

It is not an unprimeable number, because it can be changed into a prime (1221011000161) 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, 1966846 + ... + 2512071.

Almost surely, 2^{1221011000121} is an apocalyptic number.

1221011000121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221011000121 is a deficient number, since it is larger than the sum of its proper divisors (570842850631).

1221011000121 is a wasteful number, since it uses less digits than its factorization.

1221011000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479693 (or 4479682 counting only the distinct ones).

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

Adding to 1221011000121 its reverse (1210001101221), we get a palindrome (2431012101342).

The spelling of 1221011000121 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one", and thus it is an aban number.