21110222112 has 192 divisors, whose sum is σ = 67018420224. Its totient is φ = 5687700480.

The previous prime is 21110222101. The next prime is 21110222129. The reversal of 21110222112 is 21122201112.

It is a junction number, because it is equal to n+sod(n) for n = 21110222091 and 21110222100.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1087758 + ... + 1106994.

It is an arithmetic number, because the mean of its divisors is an integer number (349054272).

Almost surely, 2^21110222112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110222112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33509210112).

21110222112 is an abundant number, since it is smaller than the sum of its proper divisors (45908198112).

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

21110222112 is a wasteful number, since it uses less digits than its factorization.

21110222112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19351 (or 19343 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21110222112 its reverse (21122201112), we get a palindrome (42232423224).

The spelling of 21110222112 in words is "twenty-one billion, one hundred ten million, two hundred twenty-two thousand, one hundred twelve".