100021680 has 240 divisors, whose sum is σ = 373610016. Its totient is φ = 23777280.

The previous prime is 100021679. The next prime is 100021699. The reversal of 100021680 is 86120001.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 578074 + ... + 578246.

Almost surely, 2^100021680 is an apocalyptic number.

100021680 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 100021680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186805008).

100021680 is an abundant number, since it is smaller than the sum of its proper divisors (273588336).

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

100021680 is a wasteful number, since it uses less digits than its factorization.

100021680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 100021680 is about 10001.0839412536. The cubic root of 100021680 is about 464.1924241528.

Adding to 100021680 its reverse (86120001), we get a palindrome (186141681).

The spelling of 100021680 in words is "one hundred million, twenty-one thousand, six hundred eighty".