100313221 has 4 divisors (see below), whose sum is σ = 100751500. Its totient is φ = 99874944.

The previous prime is 100313203. The next prime is 100313231. The reversal of 100313221 is 122313001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122313001 = 503 ⋅243167.

It can be written as a sum of positive squares in 2 ways, for example, as 93993025 + 6320196 = 9695^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 100313221 - 2⁷ = 100313093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100313201) 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, 218796 + ... + 219253.

It is an arithmetic number, because the mean of its divisors is an integer number (25187875).

Almost surely, 2^100313221 is an apocalyptic number.

It is an amenable number.

100313221 is a deficient number, since it is larger than the sum of its proper divisors (438279).

100313221 is an equidigital number, since it uses as much as digits as its factorization.

100313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438278.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 100313221 is about 10015.6488057439. The cubic root of 100313221 is about 464.6429926339.

Adding to 100313221 its reverse (122313001), we get a palindrome (222626222).

The spelling of 100313221 in words is "one hundred million, three hundred thirteen thousand, two hundred twenty-one".