100133821 has 4 divisors (see below), whose sum is σ = 100431292. Its totient is φ = 99836352.

The previous prime is 100133807. The next prime is 100133827. The reversal of 100133821 is 128331001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48149721 + 51984100 = 6939^2 + 7210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100133821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100133827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148230 + ... + 148903.

It is an arithmetic number, because the mean of its divisors is an integer number (25107823).

Almost surely, 2^100133821 is an apocalyptic number.

It is an amenable number.

100133821 is a deficient number, since it is larger than the sum of its proper divisors (297471).

100133821 is an equidigital number, since it uses as much as digits as its factorization.

100133821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297470.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 100133821 is about 10006.6888129890. The cubic root of 100133821 is about 464.3658384254.

Adding to 100133821 its reverse (128331001), we get a palindrome (228464822).

The spelling of 100133821 in words is "one hundred million, one hundred thirty-three thousand, eight hundred twenty-one".