21112222120 has 64 divisors (see below), whose sum is σ = 51838496640. Its totient is φ = 7674566400.

The previous prime is 21112222081. The next prime is 21112222121. The reversal of 21112222120 is 2122221112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112222094 and 21112222103.

It is not an unprimeable number, because it can be changed into a prime (21112222121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1693510 + ... + 1705930.

It is an arithmetic number, because the mean of its divisors is an integer number (809976510).

Almost surely, 2^21112222120 is an apocalyptic number.

21112222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112222120 is an abundant number, since it is smaller than the sum of its proper divisors (30726274520).

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

21112222120 is a wasteful number, since it uses less digits than its factorization.

21112222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16306 (or 16302 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112222120 its reverse (2122221112), we get a palindrome (23234443232).

The spelling of 21112222120 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, one hundred twenty".