22122121222220 has 96 divisors (see below), whose sum is σ = 49098759413760. Its totient is φ = 8360086014720.

The previous prime is 22122121222211. The next prime is 22122121222309. The reversal of 22122121222220 is 2222212122122.

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, 10612451 + ... + 12524709.

It is an arithmetic number, because the mean of its divisors is an integer number (511445410560).

Almost surely, 2^{22122121222220} is an apocalyptic number.

22122121222220 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 22122121222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24549379706880).

22122121222220 is an abundant number, since it is smaller than the sum of its proper divisors (26976638191540).

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

22122121222220 is a wasteful number, since it uses less digits than its factorization.

22122121222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912743 (or 1912741 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 22122121222220 its reverse (2222212122122), we get a palindrome (24344333344342).

The spelling of 22122121222220 in words is "twenty-two trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".