21112221112011 has 12 divisors (see below), whose sum is σ = 30520992480888. Its totient is φ = 14063016235104.

The previous prime is 21112221111983. The next prime is 21112221112013. The reversal of 21112221112011 is 11021112221112.

It is a happy number.

21112221112011 is a `hidden beast` number, since 211 + 122 + 211 + 120 + 1 + 1 = 666.

It is not a de Polignac number, because 21112221112011 - 2¹³ = 21112221103819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112221112013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 983141965 + ... + 983163438.

It is an arithmetic number, because the mean of its divisors is an integer number (2543416040074).

Almost surely, 2^{21112221112011} is an apocalyptic number.

21112221112011 is a deficient number, since it is larger than the sum of its proper divisors (9408771368877).

21112221112011 is a wasteful number, since it uses less digits than its factorization.

21112221112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966306602 (or 1966306599 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21112221112011 its reverse (11021112221112), we get a palindrome (32133333333123).

The spelling of 21112221112011 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twelve thousand, eleven".