100325821 has 4 divisors (see below), whose sum is σ = 100707552. Its totient is φ = 99944092.

The previous prime is 100325749. The next prime is 100325831. The reversal of 100325821 is 128523001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128523001 = 43 ⋅2988907.

It is a cyclic number.

It is not a de Polignac number, because 100325821 - 2¹⁷ = 100194749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100325792 and 100325801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100325831) 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 3 ways as a sum of consecutive naturals, for example, 190471 + ... + 190996.

It is an arithmetic number, because the mean of its divisors is an integer number (25176888).

Almost surely, 2^100325821 is an apocalyptic number.

It is an amenable number.

100325821 is a deficient number, since it is larger than the sum of its proper divisors (381731).

100325821 is an equidigital number, since it uses as much as digits as its factorization.

100325821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381730.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 100325821 is about 10016.2778016587. The cubic root of 100325821 is about 464.6624458909.

Adding to 100325821 its reverse (128523001), we get a palindrome (228848822).

The spelling of 100325821 in words is "one hundred million, three hundred twenty-five thousand, eight hundred twenty-one".