10001221110121 has 4 divisors (see below), whose sum is σ = 10001282098500. Its totient is φ = 10001160121744.

The previous prime is 10001221110119. The next prime is 10001221110157. The reversal of 10001221110121 is 12101112210001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1265649750121 + 8735571360000 = 1125011^2 + 2955600^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001221110121 - 2¹ = 10001221110119 is a prime.

It is a super-3 number, since 3×10001221110121³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10001221110161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30247546 + ... + 30576403.

It is an arithmetic number, because the mean of its divisors is an integer number (2500320524625).

Almost surely, 2^{10001221110121} is an apocalyptic number.

It is an amenable number.

10001221110121 is a deficient number, since it is larger than the sum of its proper divisors (60988379).

10001221110121 is an equidigital number, since it uses as much as digits as its factorization.

10001221110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60988378.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10001221110121 its reverse (12101112210001), we get a palindrome (22102333320122).

The spelling of 10001221110121 in words is "ten trillion, one billion, two hundred twenty-one million, one hundred ten thousand, one hundred twenty-one".