2168721270 has 64 divisors (see below), whose sum is σ = 5864762880. Its totient is φ = 570175200.

The previous prime is 2168721251. The next prime is 2168721277. The reversal of 2168721270 is 721278612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168721277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37396 + ... + 75735.

It is an arithmetic number, because the mean of its divisors is an integer number (91636920).

Almost surely, 2^2168721270 is an apocalyptic number.

2168721270 is an abundant number, since it is smaller than the sum of its proper divisors (3696041610).

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

2168721270 is a wasteful number, since it uses less digits than its factorization.

2168721270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113218 (or 113212 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 2168721270 is about 46569.5315630295. The cubic root of 2168721270 is about 1294.3982376311.

Adding to 2168721270 its reverse (721278612), we get a palindrome (2889999882).

The spelling of 2168721270 in words is "two billion, one hundred sixty-eight million, seven hundred twenty-one thousand, two hundred seventy".