21100120001011 has 4 divisors (see below), whose sum is σ = 21100922038800. Its totient is φ = 21099317963224.

The previous prime is 21100120000991. The next prime is 21100120001033. The reversal of 21100120001011 is 11010002100112.

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

It is a cyclic number.

It is not a de Polignac number, because 21100120001011 - 2¹¹ = 21100119998963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100120001071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400979431 + ... + 401032048.

It is an arithmetic number, because the mean of its divisors is an integer number (5275230509700).

Almost surely, 2^{21100120001011} is an apocalyptic number.

21100120001011 is a deficient number, since it is larger than the sum of its proper divisors (802037789).

21100120001011 is an equidigital number, since it uses as much as digits as its factorization.

21100120001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802037788.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21100120001011 its reverse (11010002100112), we get a palindrome (32110122101123).

The spelling of 21100120001011 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, one thousand, eleven".