100817421 has 4 divisors (see below), whose sum is σ = 134423232. Its totient is φ = 67211612.

The previous prime is 100817417. The next prime is 100817443. The reversal of 100817421 is 124718001.

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.

It is a cyclic number.

It is not a de Polignac number, because 100817421 - 2² = 100817417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100817391 and 100817400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100817471) 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, 16802901 + ... + 16802906.

It is an arithmetic number, because the mean of its divisors is an integer number (33605808).

Almost surely, 2^100817421 is an apocalyptic number.

It is an amenable number.

100817421 is a deficient number, since it is larger than the sum of its proper divisors (33605811).

100817421 is an equidigital number, since it uses as much as digits as its factorization.

100817421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33605810.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 100817421 is about 10040.7878674933. The cubic root of 100817421 is about 465.4201636506.

The spelling of 100817421 in words is "one hundred million, eight hundred seventeen thousand, four hundred twenty-one".