21022102211111 has 4 divisors (see below), whose sum is σ = 21534836411424. Its totient is φ = 20509368010800.

The previous prime is 21022102211107. The next prime is 21022102211113. The reversal of 21022102211111 is 11111220122012.

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 21022102211111 - 2² = 21022102211107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022102211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022102211113) 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, 256367100095 + ... + 256367100176.

It is an arithmetic number, because the mean of its divisors is an integer number (5383709102856).

Almost surely, 2^{21022102211111} is an apocalyptic number.

21022102211111 is a deficient number, since it is larger than the sum of its proper divisors (512734200313).

21022102211111 is an equidigital number, since it uses as much as digits as its factorization.

21022102211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512734200312.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21022102211111 its reverse (11111220122012), we get a palindrome (32133322333123).

The spelling of 21022102211111 in words is "twenty-one trillion, twenty-two billion, one hundred two million, two hundred eleven thousand, one hundred eleven".