21111101101011 has 4 divisors (see below), whose sum is σ = 28148134801352. Its totient is φ = 14074067400672.

The previous prime is 21111101100979. The next prime is 21111101101021. The reversal of 21111101101011 is 11010110111112.

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

It is not a de Polignac number, because 21111101101011 - 2⁵ = 21111101100979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111101101021) 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, 3518516850166 + ... + 3518516850171.

It is an arithmetic number, because the mean of its divisors is an integer number (7037033700338).

Almost surely, 2^{21111101101011} is an apocalyptic number.

21111101101011 is a deficient number, since it is larger than the sum of its proper divisors (7037033700341).

21111101101011 is an equidigital number, since it uses as much as digits as its factorization.

21111101101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037033700340.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 21111101101011 its reverse (11010110111112), we get a palindrome (32121211212123).

The spelling of 21111101101011 in words is "twenty-one trillion, one hundred eleven billion, one hundred one million, one hundred one thousand, eleven".