21112022120 has 128 divisors (see below), whose sum is σ = 56491084800. Its totient is φ = 6950501376.

The previous prime is 21112022111. The next prime is 21112022123. The reversal of 21112022120 is 2122021112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21112022095 and 21112022104.

It is not an unprimeable number, because it can be changed into a prime (21112022123) 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 31 ways as a sum of consecutive naturals, for example, 682346 + ... + 712614.

It is an arithmetic number, because the mean of its divisors is an integer number (441336600).

Almost surely, 2^21112022120 is an apocalyptic number.

21112022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112022120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28245542400).

21112022120 is an abundant number, since it is smaller than the sum of its proper divisors (35379062680).

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

21112022120 is a wasteful number, since it uses less digits than its factorization.

21112022120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30387 (or 30383 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21112022120 its reverse (2122021112), we get a palindrome (23234043232).

The spelling of 21112022120 in words is "twenty-one billion, one hundred twelve million, twenty-two thousand, one hundred twenty".