21022011112111 has 4 divisors (see below), whose sum is σ = 21022021400400. Its totient is φ = 21022000823824.

The previous prime is 21022011112061. The next prime is 21022011112117. The reversal of 21022011112111 is 11121111022012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21022011112111 - 2²¹ = 21022009014959 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 (21022011112117) 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, 926566 + ... + 6550003.

It is an arithmetic number, because the mean of its divisors is an integer number (5255505350100).

Almost surely, 2^{21022011112111} is an apocalyptic number.

21022011112111 is a deficient number, since it is larger than the sum of its proper divisors (10288289).

21022011112111 is an equidigital number, since it uses as much as digits as its factorization.

21022011112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10288288.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21022011112111 its reverse (11121111022012), we get a palindrome (32143122134123).

Subtracting from 21022011112111 its reverse (11121111022012), we obtain a palindrome (9900900090099).

The spelling of 21022011112111 in words is "twenty-one trillion, twenty-two billion, eleven million, one hundred twelve thousand, one hundred eleven".