10001201112121 has 4 divisors (see below), whose sum is σ = 10001226179044. Its totient is φ = 10001176045200.

The previous prime is 10001201112113. The next prime is 10001201112127. The reversal of 10001201112121 is 12121110210001.

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 7433720455225 + 2567480656896 = 2726485^2 + 1602336^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001201112121 - 2³ = 10001201112113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10001201112127) 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, 11925150 + ... + 12736231.

It is an arithmetic number, because the mean of its divisors is an integer number (2500306544761).

Almost surely, 2^{10001201112121} is an apocalyptic number.

It is an amenable number.

10001201112121 is a deficient number, since it is larger than the sum of its proper divisors (25066923).

10001201112121 is an equidigital number, since it uses as much as digits as its factorization.

10001201112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25066922.

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

Adding to 10001201112121 its reverse (12121110210001), we get a palindrome (22122311322122).

The spelling of 10001201112121 in words is "ten trillion, one billion, two hundred one million, one hundred twelve thousand, one hundred twenty-one".