21110011011221 has 4 divisors (see below), whose sum is σ = 23029102921344. Its totient is φ = 19190919101100.

The previous prime is 21110011011163. The next prime is 21110011011253. The reversal of 21110011011221 is 12211011001112.

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 21110011011221 - 2⁶ = 21110011011157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110011011196 and 21110011011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110011011121) 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, 959545955045 + ... + 959545955066.

It is an arithmetic number, because the mean of its divisors is an integer number (5757275730336).

Almost surely, 2^{21110011011221} is an apocalyptic number.

It is an amenable number.

21110011011221 is a deficient number, since it is larger than the sum of its proper divisors (1919091910123).

21110011011221 is a wasteful number, since it uses less digits than its factorization.

21110011011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919091910122.

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

Adding to 21110011011221 its reverse (12211011001112), we get a palindrome (33321022012333).

The spelling of 21110011011221 in words is "twenty-one trillion, one hundred ten billion, eleven million, eleven thousand, two hundred twenty-one".