22222221440 has 64 divisors (see below), whose sum is σ = 53213448960. Its totient is φ = 8874089472.

The previous prime is 22222221433. The next prime is 22222221467. The reversal of 22222221440 is 4412222222.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359879 + ... + 417081.

It is an arithmetic number, because the mean of its divisors is an integer number (831460140).

Almost surely, 2^22222221440 is an apocalyptic number.

22222221440 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 22222221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26606724480).

22222221440 is an abundant number, since it is smaller than the sum of its proper divisors (30991227520).

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

22222221440 is an equidigital number, since it uses as much as digits as its factorization.

22222221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57829 (or 57817 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 22222221440 its reverse (4412222222), we get a palindrome (26634443662).

The spelling of 22222221440 in words is "twenty-two billion, two hundred twenty-two million, two hundred twenty-one thousand, four hundred forty".