100860021 has 12 divisors (see below), whose sum is σ = 145892448. Its totient is φ = 67145064.

The previous prime is 100860017. The next prime is 100860047. The reversal of 100860021 is 120068001.

It is not a de Polignac number, because 100860021 - 2² = 100860017 is a prime.

It is a super-2 number, since 2×100860021² = 20345487672240882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100859976 and 100860003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100860091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 855 + ... + 14228.

It is an arithmetic number, because the mean of its divisors is an integer number (12157704).

Almost surely, 2^100860021 is an apocalyptic number.

It is an amenable number.

100860021 is a deficient number, since it is larger than the sum of its proper divisors (45032427).

100860021 is a wasteful number, since it uses less digits than its factorization.

100860021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15832 (or 15829 counting only the distinct ones).

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

The square root of 100860021 is about 10042.9089909249. The cubic root of 100860021 is about 465.4857082322.

The spelling of 100860021 in words is "one hundred million, eight hundred sixty thousand, twenty-one".