21101102210011 has 4 divisors (see below), whose sum is σ = 21101403720024. Its totient is φ = 21100800700000.

The previous prime is 21101102210009. The next prime is 21101102210051. The reversal of 21101102210011 is 11001220110112.

It is a happy number.

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 21101102210011 - 2¹ = 21101102210009 is a prime.

It is a super-2 number, since 2×21101102210011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101102209973 and 21101102210000.

It is not an unprimeable number, because it can be changed into a prime (21101102210051) 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, 150650005 + ... + 150790006.

It is an arithmetic number, because the mean of its divisors is an integer number (5275350930006).

Almost surely, 2^{21101102210011} is an apocalyptic number.

21101102210011 is a deficient number, since it is larger than the sum of its proper divisors (301510013).

21101102210011 is an equidigital number, since it uses as much as digits as its factorization.

21101102210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301510012.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101102210011 its reverse (11001220110112), we get a palindrome (32102322320123).

The spelling of 21101102210011 in words is "twenty-one trillion, one hundred one billion, one hundred two million, two hundred ten thousand, eleven".