8121013240 has 64 divisors (see below), whose sum is σ = 18480908160. Its totient is φ = 3211443840.

The previous prime is 8121013223. The next prime is 8121013247. The reversal of 8121013240 is 423101218.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121013247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2442219 + ... + 2445541.

It is an arithmetic number, because the mean of its divisors is an integer number (288764190).

Almost surely, 2^8121013240 is an apocalyptic number.

It is an amenable number.

8121013240 is an abundant number, since it is smaller than the sum of its proper divisors (10359894920).

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

8121013240 is a wasteful number, since it uses less digits than its factorization.

8121013240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012 (or 4008 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 8121013240 is about 90116.6646076074. The cubic root of 8121013240 is about 2010.0340117839.

Adding to 8121013240 its reverse (423101218), we get a palindrome (8544114458).

The spelling of 8121013240 in words is "eight billion, one hundred twenty-one million, thirteen thousand, two hundred forty".