100824421 has 4 divisors (see below), whose sum is σ = 101381644. Its totient is φ = 100267200.

The previous prime is 100824397. The next prime is 100824443. The reversal of 100824421 is 124428001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124428001 = 173 ⋅719237.

It can be written as a sum of positive squares in 2 ways, for example, as 34222500 + 66601921 = 5850^2 + 8161^2 .

It is a cyclic number.

It is not a de Polignac number, because 100824421 - 2⁹ = 100823909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100824392 and 100824401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100824491) 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, 278340 + ... + 278701.

It is an arithmetic number, because the mean of its divisors is an integer number (25345411).

Almost surely, 2^100824421 is an apocalyptic number.

It is an amenable number.

100824421 is a deficient number, since it is larger than the sum of its proper divisors (557223).

100824421 is an equidigital number, since it uses as much as digits as its factorization.

100824421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557222.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 100824421 is about 10041.1364396666. The cubic root of 100824421 is about 465.4309351545.

The spelling of 100824421 in words is "one hundred million, eight hundred twenty-four thousand, four hundred twenty-one".