21112220112011 has 6 divisors (see below), whose sum is σ = 24559113191580. Its totient is φ = 18096188667396.

The previous prime is 21112220111993. The next prime is 21112220112017. The reversal of 21112220112011 is 11021102221112.

It is a de Polignac number, because none of the positive numbers 2^k-21112220112011 is a prime.

It is a super-2 number, since 2×21112220112011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112220112017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215430817421 + ... + 215430817518.

It is an arithmetic number, because the mean of its divisors is an integer number (4093185531930).

Almost surely, 2^{21112220112011} is an apocalyptic number.

21112220112011 is a deficient number, since it is larger than the sum of its proper divisors (3446893079569).

21112220112011 is an equidigital number, since it uses as much as digits as its factorization.

21112220112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430861634953 (or 430861634946 counting only the distinct ones).

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

Adding to 21112220112011 its reverse (11021102221112), we get a palindrome (32133322333123).

The spelling of 21112220112011 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, one hundred twelve thousand, eleven".