21112131222 has 64 divisors (see below), whose sum is σ = 57742594560. Its totient is φ = 5568033312.

The previous prime is 21112131179. The next prime is 21112131239. The reversal of 21112131222 is 22213121112.

21112131222 is a `hidden beast` number, since 211 + 121 + 312 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a junction number, because it is equal to n+sod(n) for n = 21112131195 and 21112131204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2143248 + ... + 2153075.

It is an arithmetic number, because the mean of its divisors is an integer number (902228040).

Almost surely, 2^21112131222 is an apocalyptic number.

21112131222 is an abundant number, since it is smaller than the sum of its proper divisors (36630463338).

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

21112131222 is a wasteful number, since it uses less digits than its factorization.

21112131222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296354 (or 4296348 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21112131222 its reverse (22213121112), we get a palindrome (43325252334).

The spelling of 21112131222 in words is "twenty-one billion, one hundred twelve million, one hundred thirty-one thousand, two hundred twenty-two".