21102100120011 has 4 divisors (see below), whose sum is σ = 28136133493352. Its totient is φ = 14068066746672.

The previous prime is 21102100119977. The next prime is 21102100120019. The reversal of 21102100120011 is 11002100120112.

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

It is not a de Polignac number, because 21102100120011 - 2²⁹ = 21101563249099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102100120019) 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, 3517016686666 + ... + 3517016686671.

It is an arithmetic number, because the mean of its divisors is an integer number (7034033373338).

Almost surely, 2^{21102100120011} is an apocalyptic number.

21102100120011 is a deficient number, since it is larger than the sum of its proper divisors (7034033373341).

21102100120011 is an equidigital number, since it uses as much as digits as its factorization.

21102100120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034033373340.

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

Adding to 21102100120011 its reverse (11002100120112), we get a palindrome (32104200240123).

The spelling of 21102100120011 in words is "twenty-one trillion, one hundred two billion, one hundred million, one hundred twenty thousand, eleven".