21101102011121 has 4 divisors (see below), whose sum is σ = 23019384012144. Its totient is φ = 19182820010100.

The previous prime is 21101102011117. The next prime is 21101102011123. The reversal of 21101102011121 is 12111020110112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101102011121 - 2² = 21101102011117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101102011096 and 21101102011105.

It is not an unprimeable number, because it can be changed into a prime (21101102011123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959141000495 + ... + 959141000516.

It is an arithmetic number, because the mean of its divisors is an integer number (5754846003036).

Almost surely, 2^{21101102011121} is an apocalyptic number.

It is an amenable number.

21101102011121 is a deficient number, since it is larger than the sum of its proper divisors (1918282001023).

21101102011121 is a wasteful number, since it uses less digits than its factorization.

21101102011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918282001022.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21101102011121 its reverse (12111020110112), we get a palindrome (33212122121233).

The spelling of 21101102011121 in words is "twenty-one trillion, one hundred one billion, one hundred two million, eleven thousand, one hundred twenty-one".