2170721315 has 24 divisors (see below), whose sum is σ = 3068533440. Its totient is φ = 1469639808.

The previous prime is 2170721263. The next prime is 2170721317. The reversal of 2170721315 is 5131270712.

It is not a de Polignac number, because 2170721315 - 2²⁸ = 1902285859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2170721317) 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 23 ways as a sum of consecutive naturals, for example, 36722 + ... + 75431.

It is an arithmetic number, because the mean of its divisors is an integer number (127855560).

Almost surely, 2^2170721315 is an apocalyptic number.

2170721315 is a deficient number, since it is larger than the sum of its proper divisors (897812125).

2170721315 is a wasteful number, since it uses less digits than its factorization.

2170721315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112251 (or 112244 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 2170721315 is about 46591.0003648773. Note that the first 3 decimals coincide. The cubic root of 2170721315 is about 1294.7960233881.

The spelling of 2170721315 in words is "two billion, one hundred seventy million, seven hundred twenty-one thousand, three hundred fifteen".