100820101 has 4 divisors (see below), whose sum is σ = 100840204. Its totient is φ = 100800000.

The previous prime is 100820053. The next prime is 100820143. The reversal of 100820101 is 101028001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101028001 = 59 ⋅1712339.

It can be written as a sum of positive squares in 2 ways, for example, as 54375876 + 46444225 = 7374^2 + 6815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100820101 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 (100820191) 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, 4351 + ... + 14851.

It is an arithmetic number, because the mean of its divisors is an integer number (25210051).

Almost surely, 2^100820101 is an apocalyptic number.

It is an amenable number.

100820101 is a deficient number, since it is larger than the sum of its proper divisors (20103).

100820101 is an equidigital number, since it uses as much as digits as its factorization.

100820101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20102.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 100820101 is about 10040.9213222692. The cubic root of 100820101 is about 465.4242876567.

Adding to 100820101 its reverse (101028001), we get a palindrome (201848102).

The spelling of 100820101 in words is "one hundred million, eight hundred twenty thousand, one hundred one".