100121320 has 64 divisors (see below), whose sum is σ = 250467840. Its totient is φ = 35769600.

The previous prime is 100121299. The next prime is 100121321. The reversal of 100121320 is 23121001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 100121297 and 100121306.

It is not an unprimeable number, because it can be changed into a prime (100121321) 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, 13015 + ... + 19225.

It is an arithmetic number, because the mean of its divisors is an integer number (3913560).

Almost surely, 2^100121320 is an apocalyptic number.

100121320 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 100121320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125233920).

100121320 is an abundant number, since it is smaller than the sum of its proper divisors (150346520).

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

100121320 is a wasteful number, since it uses less digits than its factorization.

100121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6266 (or 6262 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 100121320 is about 10006.0641612974. The cubic root of 100121320 is about 464.3465133566.

Adding to 100121320 its reverse (23121001), we get a palindrome (123242321).

The spelling of 100121320 in words is "one hundred million, one hundred twenty-one thousand, three hundred twenty".