100270821 has 8 divisors (see below), whose sum is σ = 152793664. Its totient is φ = 57297600.

The previous prime is 100270799. The next prime is 100270837. The reversal of 100270821 is 128072001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100270821 - 2⁶ = 100270757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 4774801 = 100270821 / (1 + 0 + 0 + 2 + 7 + 0 + 8 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100270721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2387380 + ... + 2387421.

It is an arithmetic number, because the mean of its divisors is an integer number (19099208).

Almost surely, 2^100270821 is an apocalyptic number.

It is an amenable number.

100270821 is a deficient number, since it is larger than the sum of its proper divisors (52522843).

100270821 is an equidigital number, since it uses as much as digits as its factorization.

100270821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774811.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 100270821 is about 10013.5318943917. The cubic root of 100270821 is about 464.5775189139.

The spelling of 100270821 in words is "one hundred million, two hundred seventy thousand, eight hundred twenty-one".