100521010505 has 4 divisors (see below), whose sum is σ = 120625212612. Its totient is φ = 80416808400.

The previous prime is 100521010501. The next prime is 100521010567. The reversal of 100521010505 is 505010125001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505010125001 = 15667 ⋅32234003.

It can be written as a sum of positive squares in 2 ways, for example, as 19713283216 + 80807727289 = 140404^2 + 284267^2 .

It is not a de Polignac number, because 100521010505 - 2² = 100521010501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100521010501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10052101046 + ... + 10052101055.

It is an arithmetic number, because the mean of its divisors is an integer number (30156303153).

Almost surely, 2^100521010505 is an apocalyptic number.

It is an amenable number.

100521010505 is a deficient number, since it is larger than the sum of its proper divisors (20104202107).

100521010505 is an equidigital number, since it uses as much as digits as its factorization.

100521010505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20104202106.

The product of its (nonzero) digits is 250, while the sum is 20.

Adding to 100521010505 its reverse (505010125001), we get a palindrome (605531135506).

The spelling of 100521010505 in words is "one hundred billion, five hundred twenty-one million, ten thousand, five hundred five".