100345521 has 4 divisors (see below), whose sum is σ = 133794032. Its totient is φ = 66897012.

The previous prime is 100345519. The next prime is 100345523. The reversal of 100345521 is 125543001.

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 an interprime number because it is at equal distance from previous prime (100345519) and next prime (100345523).

It is not a de Polignac number, because 100345521 - 2¹ = 100345519 is a prime.

It is a super-2 number, since 2×100345521² = 20138447169522882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100345523) 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, 16724251 + ... + 16724256.

It is an arithmetic number, because the mean of its divisors is an integer number (33448508).

Almost surely, 2^100345521 is an apocalyptic number.

It is an amenable number.

100345521 is a deficient number, since it is larger than the sum of its proper divisors (33448511).

100345521 is an equidigital number, since it uses as much as digits as its factorization.

100345521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33448510.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 100345521 is about 10017.2611526305. The cubic root of 100345521 is about 464.6928576400.

Adding to 100345521 its reverse (125543001), we get a palindrome (225888522).

The spelling of 100345521 in words is "one hundred million, three hundred forty-five thousand, five hundred twenty-one".