21101200012011 has 12 divisors (see below), whose sum is σ = 32728391855592. Its totient is φ = 12057828578208.

The previous prime is 21101200011989. The next prime is 21101200012093. The reversal of 21101200012011 is 11021000210112.

It is a de Polignac number, because none of the positive numbers 2^k-21101200012011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101200011011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71772789010 + ... + 71772789303.

It is an arithmetic number, because the mean of its divisors is an integer number (2727365987966).

Almost surely, 2^{21101200012011} is an apocalyptic number.

21101200012011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21101200012011 is a deficient number, since it is larger than the sum of its proper divisors (11627191843581).

21101200012011 is a wasteful number, since it uses less digits than its factorization.

21101200012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143545578330 (or 143545578323 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101200012011 its reverse (11021000210112), we get a palindrome (32122200222123).

The spelling of 21101200012011 in words is "twenty-one trillion, one hundred one billion, two hundred million, twelve thousand, eleven".