100000021200 has 60 divisors (see below), whose sum is σ = 320333405088. Its totient is φ = 26666672000.

The previous prime is 100000021193. The next prime is 100000021201. The reversal of 100000021200 is 2120000001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41665476 + ... + 41667875.

Almost surely, 2^100000021200 is an apocalyptic number.

100000021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100000021200 is an abundant number, since it is smaller than the sum of its proper divisors (220333383888).

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

100000021200 is a wasteful number, since it uses less digits than its factorization.

100000021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83333372 (or 83333361 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 100000021200 its reverse (2120000001), we get a palindrome (102120021201).

The spelling of 100000021200 in words is "one hundred billion, twenty-one thousand, two hundred".