10555121444 has 48 divisors (see below), whose sum is σ = 21579694080. Its totient is φ = 4423209120.

The previous prime is 10555121441. The next prime is 10555121497. The reversal of 10555121444 is 44412155501.

It is a happy number.

It is a super-2 number, since 2×10555121444² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10555121444.

It is not an unprimeable number, because it can be changed into a prime (10555121441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1680029 + ... + 1686299.

It is an arithmetic number, because the mean of its divisors is an integer number (449576960).

Almost surely, 2^10555121444 is an apocalyptic number.

10555121444 is a gapful number since it is divisible by the number (14) 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 10555121444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10789847040).

10555121444 is an abundant number, since it is smaller than the sum of its proper divisors (11024572636).

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

10555121444 is a wasteful number, since it uses less digits than its factorization.

10555121444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7608 (or 7606 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 10555121444 its reverse (44412155501), we get a palindrome (54967276945).

The spelling of 10555121444 in words is "ten billion, five hundred fifty-five million, one hundred twenty-one thousand, four hundred forty-four".