20100021111011 has 4 divisors (see below), whose sum is σ = 20100030093024. Its totient is φ = 20100012129000.

The previous prime is 20100021110999. The next prime is 20100021111019. The reversal of 20100021111011 is 11011112000102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20100021111011 - 2¹⁴ = 20100021094627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100021110983 and 20100021111001.

It is not an unprimeable number, because it can be changed into a prime (20100021111019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851161 + ... + 6605061.

It is an arithmetic number, because the mean of its divisors is an integer number (5025007523256).

Almost surely, 2^{20100021111011} is an apocalyptic number.

20100021111011 is a deficient number, since it is larger than the sum of its proper divisors (8982013).

20100021111011 is an equidigital number, since it uses as much as digits as its factorization.

20100021111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8982012.

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

Adding to 20100021111011 its reverse (11011112000102), we get a palindrome (31111133111113).

The spelling of 20100021111011 in words is "twenty trillion, one hundred billion, twenty-one million, one hundred eleven thousand, eleven".