21211111122 has 32 divisors (see below), whose sum is σ = 44144559360. Its totient is φ = 6788888400.

The previous prime is 21211111091. The next prime is 21211111127. The reversal of 21211111122 is 22111111212.

It is a happy number.

It is a super-2 number, since 2×21211111122² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21211111127) 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 15 ways as a sum of consecutive naturals, for example, 681504 + ... + 711947.

It is an arithmetic number, because the mean of its divisors is an integer number (1379517480).

Almost surely, 2^21211111122 is an apocalyptic number.

21211111122 is an abundant number, since it is smaller than the sum of its proper divisors (22933448238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211111122 is a wasteful number, since it uses less digits than its factorization.

21211111122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393558.

The product of its digits is 16, while the sum is 15.

Adding to 21211111122 its reverse (22111111212), we get a palindrome (43322222334).

The spelling of 21211111122 in words is "twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-two".