1221000110121 has 24 divisors (see below), whose sum is σ = 1789564795200. Its totient is φ = 739954541920.

The previous prime is 1221000110069. The next prime is 1221000110173. The reversal of 1221000110121 is 1210110001221.

It is an interprime number because it is at equal distance from previous prime (1221000110069) and next prime (1221000110173).

It is not a de Polignac number, because 1221000110121 - 2¹³ = 1221000101929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221000110097 and 1221000110106.

It is not an unprimeable number, because it can be changed into a prime (1221000110821) 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, 6360655 + ... + 6549803.

It is an arithmetic number, because the mean of its divisors is an integer number (74565199800).

Almost surely, 2^{1221000110121} is an apocalyptic number.

1221000110121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221000110121 is a deficient number, since it is larger than the sum of its proper divisors (568564685079).

1221000110121 is a wasteful number, since it uses less digits than its factorization.

1221000110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206957 (or 206946 counting only the distinct ones).

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

Adding to 1221000110121 its reverse (1210110001221), we get a palindrome (2431110111342).

The spelling of 1221000110121 in words is "one trillion, two hundred twenty-one billion, one hundred ten thousand, one hundred twenty-one".