21121003331111 has 8 divisors (see below), whose sum is σ = 23199271393920. Its totient is φ = 19139398899192.

The previous prime is 21121003331081. The next prime is 21121003331119. The reversal of 21121003331111 is 11113330012112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121003331111 - 2²⁶ = 21120936222247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121003331119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24165907265 + ... + 24165908138.

It is an arithmetic number, because the mean of its divisors is an integer number (2899908924240).

Almost surely, 2^{21121003331111} is an apocalyptic number.

21121003331111 is a deficient number, since it is larger than the sum of its proper divisors (2078268062809).

21121003331111 is a wasteful number, since it uses less digits than its factorization.

21121003331111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48331815445.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21121003331111 its reverse (11113330012112), we get a palindrome (32234333343223).

The spelling of 21121003331111 in words is "twenty-one trillion, one hundred twenty-one billion, three million, three hundred thirty-one thousand, one hundred eleven".