22121210112 has 144 divisors (see below), whose sum is σ = 61810560000. Its totient is φ = 7009970176.

The previous prime is 22121210081. The next prime is 22121210131. The reversal of 22121210112 is 21101212122.

It is a junction number, because it is equal to n+sod(n) for n = 22121210091 and 22121210100.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2946139 + ... + 2953637.

It is an arithmetic number, because the mean of its divisors is an integer number (429240000).

Almost surely, 2^22121210112 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 22121210112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30905280000).

22121210112 is an abundant number, since it is smaller than the sum of its proper divisors (39689349888).

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

22121210112 is a wasteful number, since it uses less digits than its factorization.

22121210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7708 (or 7694 counting only the distinct ones).

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

Adding to 22121210112 its reverse (21101212122), we get a palindrome (43222422234).

The spelling of 22121210112 in words is "twenty-two billion, one hundred twenty-one million, two hundred ten thousand, one hundred twelve".