2161320315 has 64 divisors (see below), whose sum is σ = 4366172160. Its totient is φ = 886803840.

The previous prime is 2161320277. The next prime is 2161320353. The reversal of 2161320315 is 5130231612.

It is an interprime number because it is at equal distance from previous prime (2161320277) and next prime (2161320353).

It is not a de Polignac number, because 2161320315 - 2⁶ = 2161320251 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 79402 + ... + 103088.

It is an arithmetic number, because the mean of its divisors is an integer number (68221440).

Almost surely, 2^2161320315 is an apocalyptic number.

2161320315 is an abundant number, since it is smaller than the sum of its proper divisors (2204851845).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161320315 is a wasteful number, since it uses less digits than its factorization.

2161320315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23792.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 2161320315 is about 46490.0023123252. The cubic root of 2161320315 is about 1292.9241430057.

Adding to 2161320315 its reverse (5130231612), we get a palindrome (7291551927).

The spelling of 2161320315 in words is "two billion, one hundred sixty-one million, three hundred twenty thousand, three hundred fifteen".