20010121110011 has 4 divisors (see below), whose sum is σ = 20010334620024. Its totient is φ = 20009907600000.

The previous prime is 20010121109987. The next prime is 20010121110043. The reversal of 20010121110011 is 11001112101002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010121110011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010121109974 and 20010121110001.

It is not an unprimeable number, because it can be changed into a prime (20010121130011) 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, 106614365 + ... + 106801886.

It is an arithmetic number, because the mean of its divisors is an integer number (5002583655006).

Almost surely, 2^{20010121110011} is an apocalyptic number.

20010121110011 is a deficient number, since it is larger than the sum of its proper divisors (213510013).

20010121110011 is an equidigital number, since it uses as much as digits as its factorization.

20010121110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213510012.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20010121110011 its reverse (11001112101002), we get a palindrome (31011233211013).

Subtracting from 20010121110011 its reverse (11001112101002), we obtain a palindrome (9009009009009).

The spelling of 20010121110011 in words is "twenty trillion, ten billion, one hundred twenty-one million, one hundred ten thousand, eleven".