100642321 has 4 divisors (see below), whose sum is σ = 108384052. Its totient is φ = 92900592.

The previous prime is 100642307. The next prime is 100642327. The reversal of 100642321 is 123246001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123246001 = 37 ⋅3330973.

It can be written as a sum of positive squares in 2 ways, for example, as 26010000 + 74632321 = 5100^2 + 8639^2 .

It is a cyclic number.

It is not a de Polignac number, because 100642321 - 2⁹ = 100641809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100642327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3870846 + ... + 3870871.

It is an arithmetic number, because the mean of its divisors is an integer number (27096013).

Almost surely, 2^100642321 is an apocalyptic number.

It is an amenable number.

100642321 is a deficient number, since it is larger than the sum of its proper divisors (7741731).

100642321 is an equidigital number, since it uses as much as digits as its factorization.

100642321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7741730.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 100642321 is about 10032.0646429337. The cubic root of 100642321 is about 465.1505597940.

Adding to 100642321 its reverse (123246001), we get a palindrome (223888322).

The spelling of 100642321 in words is "one hundred million, six hundred forty-two thousand, three hundred twenty-one".