21121133112111 has 8 divisors (see below), whose sum is σ = 28166330540160. Its totient is φ = 14078345546072.

The previous prime is 21121133112089. The next prime is 21121133112119. The reversal of 21121133112111 is 11121133112112.

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

It is a cyclic number.

It is not a de Polignac number, because 21121133112111 - 2²² = 21121128917807 is a prime.

It is a super-2 number, since 2×21121133112111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121133112119) 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, 602445051 + ... + 602480108.

It is an arithmetic number, because the mean of its divisors is an integer number (3520791317520).

Almost surely, 2^{21121133112111} is an apocalyptic number.

21121133112111 is a deficient number, since it is larger than the sum of its proper divisors (7045197428049).

21121133112111 is a wasteful number, since it uses less digits than its factorization.

21121133112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204931005.

The product of its digits is 72, while the sum is 21.

Adding to 21121133112111 its reverse (11121133112112), we get a palindrome (32242266224223).

Subtracting from 21121133112111 its reverse (11121133112112), we obtain a palindrome (9999999999999).

The spelling of 21121133112111 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred thirty-three million, one hundred twelve thousand, one hundred eleven".