100404521 has 4 divisors (see below), whose sum is σ = 114748032. Its totient is φ = 86061012.

The previous prime is 100404517. The next prime is 100404523. The reversal of 100404521 is 125404001.

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 100404521 - 2² = 100404517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100404521.

It is not an unprimeable number, because it can be changed into a prime (100404523) 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, 7171745 + ... + 7171758.

It is an arithmetic number, because the mean of its divisors is an integer number (28687008).

Almost surely, 2^100404521 is an apocalyptic number.

It is an amenable number.

100404521 is a deficient number, since it is larger than the sum of its proper divisors (14343511).

100404521 is an equidigital number, since it uses as much as digits as its factorization.

100404521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14343510.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 100404521 is about 10020.2056366125. The cubic root of 100404521 is about 464.7839147085.

Adding to 100404521 its reverse (125404001), we get a palindrome (225808522).

The spelling of 100404521 in words is "one hundred million, four hundred four thousand, five hundred twenty-one".