20011120121121 has 4 divisors (see below), whose sum is σ = 26681493494832. Its totient is φ = 13340746747412.

The previous prime is 20011120121107. The next prime is 20011120121141. The reversal of 20011120121121 is 12112102111002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20011120121121 - 2²¹ = 20011118023969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011120121121.

It is not an unprimeable number, because it can be changed into a prime (20011120121141) 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, 3335186686851 + ... + 3335186686856.

It is an arithmetic number, because the mean of its divisors is an integer number (6670373373708).

Almost surely, 2^{20011120121121} is an apocalyptic number.

It is an amenable number.

20011120121121 is a deficient number, since it is larger than the sum of its proper divisors (6670373373711).

20011120121121 is an equidigital number, since it uses as much as digits as its factorization.

20011120121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670373373710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20011120121121 its reverse (12112102111002), we get a palindrome (32123222232123).

The spelling of 20011120121121 in words is "twenty trillion, eleven billion, one hundred twenty million, one hundred twenty-one thousand, one hundred twenty-one".