21102220111 has 8 divisors (see below), whose sum is σ = 24119548544. Its totient is φ = 18085573080.

The previous prime is 21102220091. The next prime is 21102220151. The reversal of 21102220111 is 11102220112.

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 21102220111 - 2⁵ = 21102220079 is a prime.

It is a super-2 number, since 2×21102220111² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102220091 and 21102220100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102220151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102165 + ... + 229438.

It is an arithmetic number, because the mean of its divisors is an integer number (3014943568).

Almost surely, 2^21102220111 is an apocalyptic number.

21102220111 is a deficient number, since it is larger than the sum of its proper divisors (3017328433).

21102220111 is an equidigital number, since it uses as much as digits as its factorization.

21102220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340701.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21102220111 its reverse (11102220112), we get a palindrome (32204440223).

Subtracting from 21102220111 its reverse (11102220112), we obtain a palindrome (9999999999).

The spelling of 21102220111 in words is "twenty-one billion, one hundred two million, two hundred twenty thousand, one hundred eleven".