21202012110011 has 4 divisors (see below), whose sum is σ = 21202994297352. Its totient is φ = 21201029922672.

The previous prime is 21202012110007. The next prime is 21202012110029. The reversal of 21202012110011 is 11001121020212.

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 21202012110011 - 2² = 21202012110007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202012110511) 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, 491061290 + ... + 491104463.

It is an arithmetic number, because the mean of its divisors is an integer number (5300748574338).

Almost surely, 2^{21202012110011} is an apocalyptic number.

21202012110011 is a deficient number, since it is larger than the sum of its proper divisors (982187341).

21202012110011 is an equidigital number, since it uses as much as digits as its factorization.

21202012110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982187340.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21202012110011 its reverse (11001121020212), we get a palindrome (32203133130223).

The spelling of 21202012110011 in words is "twenty-one trillion, two hundred two billion, twelve million, one hundred ten thousand, eleven".