3117243221 has 4 divisors (see below), whose sum is σ = 3126175500. Its totient is φ = 3108310944.

The previous prime is 3117243211. The next prime is 3117243271. The reversal of 3117243221 is 1223427113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1223427113 = 20507 ⋅59659.

It can be written as a sum of positive squares in 2 ways, for example, as 2756775025 + 360468196 = 52505^2 + 18986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3117243221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3117243211) 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, 4465616 + ... + 4466313.

It is an arithmetic number, because the mean of its divisors is an integer number (781543875).

Almost surely, 2^3117243221 is an apocalyptic number.

It is an amenable number.

3117243221 is a deficient number, since it is larger than the sum of its proper divisors (8932279).

3117243221 is an equidigital number, since it uses as much as digits as its factorization.

3117243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8932278.

The product of its digits is 2016, while the sum is 26.

The square root of 3117243221 is about 55832.2775910136. The cubic root of 3117243221 is about 1460.7982157037.

The spelling of 3117243221 in words is "three billion, one hundred seventeen million, two hundred forty-three thousand, two hundred twenty-one".