100521440 has 48 divisors (see below), whose sum is σ = 241052112. Its totient is φ = 39604224.

The previous prime is 100521439. The next prime is 100521451. The reversal of 100521440 is 44125001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6032 + ... + 15408.

It is an arithmetic number, because the mean of its divisors is an integer number (5021919).

Almost surely, 2^100521440 is an apocalyptic number.

100521440 is a gapful number since it is divisible by the number (10) 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 100521440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120526056).

100521440 is an abundant number, since it is smaller than the sum of its proper divisors (140530672).

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

100521440 is an equidigital number, since it uses as much as digits as its factorization.

100521440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9459 (or 9451 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 100521440 is about 10026.0381008652. The cubic root of 100521440 is about 464.9642551627.

Adding to 100521440 its reverse (44125001), we get a palindrome (144646441).

The spelling of 100521440 in words is "one hundred million, five hundred twenty-one thousand, four hundred forty".