100320021040 has 80 divisors (see below), whose sum is σ = 240192805248. Its totient is φ = 38938364928.

The previous prime is 100320021029. The next prime is 100320021047. The reversal of 100320021040 is 40120023001.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 100320021040.

It is not an unprimeable number, because it can be changed into a prime (100320021047) 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, 1058649 + ... + 1149511.

Almost surely, 2^100320021040 is an apocalyptic number.

100320021040 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 100320021040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120096402624).

100320021040 is an abundant number, since it is smaller than the sum of its proper divisors (139872784208).

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

100320021040 is a wasteful number, since it uses less digits than its factorization.

100320021040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91286 (or 91280 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 100320021040 its reverse (40120023001), we get a palindrome (140440044041).

The spelling of 100320021040 in words is "one hundred billion, three hundred twenty million, twenty-one thousand, forty".