100021100 has 18 divisors (see below), whose sum is σ = 217046004. Its totient is φ = 40008400.

The previous prime is 100021093. The next prime is 100021121. The reversal of 100021100 is 1120001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 500006 + ... + 500205.

Almost surely, 2^100021100 is an apocalyptic number.

100021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100021100 is an abundant number, since it is smaller than the sum of its proper divisors (117024904).

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

100021100 is a wasteful number, since it uses less digits than its factorization.

100021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000225 (or 1000218 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 100021100 is about 10001.0549443546. The cubic root of 100021100 is about 464.1915269069.

Adding to 100021100 its reverse (1120001), we get a palindrome (101141101).

The spelling of 100021100 in words is "one hundred million, twenty-one thousand, one hundred".