20111121000121 has 4 divisors (see below), whose sum is σ = 20111141244132. Its totient is φ = 20111100756112.

The previous prime is 20111120999909. The next prime is 20111121000149. The reversal of 20111121000121 is 12100012111102.

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 8452044417600 + 11659076582521 = 2907240^2 + 3414539^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111121000121 - 2¹⁹ = 20111120475833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111121000161) 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, 8550526 + ... + 10645831.

It is an arithmetic number, because the mean of its divisors is an integer number (5027785311033).

Almost surely, 2^{20111121000121} is an apocalyptic number.

It is an amenable number.

20111121000121 is a deficient number, since it is larger than the sum of its proper divisors (20244011).

20111121000121 is a wasteful number, since it uses less digits than its factorization.

20111121000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20244010.

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

Adding to 20111121000121 its reverse (12100012111102), we get a palindrome (32211133111223).

The spelling of 20111121000121 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.