2215717321 has 4 divisors (see below), whose sum is σ = 2346053652. Its totient is φ = 2085380992.

The previous prime is 2215717313. The next prime is 2215717327. The reversal of 2215717321 is 1237175122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1237175122 = 2 ⋅618587561.

It can be written as a sum of positive squares in 2 ways, for example, as 1757286400 + 458430921 = 41920^2 + 21411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215717321 - 2³ = 2215717313 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2215717327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65168140 + ... + 65168173.

It is an arithmetic number, because the mean of its divisors is an integer number (586513413).

Almost surely, 2^2215717321 is an apocalyptic number.

It is an amenable number.

2215717321 is a deficient number, since it is larger than the sum of its proper divisors (130336331).

2215717321 is a wasteful number, since it uses less digits than its factorization.

2215717321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130336330.

The product of its digits is 5880, while the sum is 31.

The square root of 2215717321 is about 47071.4066180309. The cubic root of 2215717321 is about 1303.6813446049.

The spelling of 2215717321 in words is "two billion, two hundred fifteen million, seven hundred seventeen thousand, three hundred twenty-one".