100443863521 has 4 divisors (see below), whose sum is σ = 100452090672. Its totient is φ = 100435636372.

The previous prime is 100443863483. The next prime is 100443863539. The reversal of 100443863521 is 125368344001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125368344001 = 197 ⋅636387533.

It is a cyclic number.

It is not a de Polignac number, because 100443863521 - 2¹¹ = 100443861473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100443863591) 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, 4095235 + ... + 4119688.

It is an arithmetic number, because the mean of its divisors is an integer number (25113022668).

Almost surely, 2^100443863521 is an apocalyptic number.

It is an amenable number.

100443863521 is a deficient number, since it is larger than the sum of its proper divisors (8227151).

100443863521 is an equidigital number, since it uses as much as digits as its factorization.

100443863521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8227150.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 100443863521 in words is "one hundred billion, four hundred forty-three million, eight hundred sixty-three thousand, five hundred twenty-one".