8147121140 has 24 divisors (see below), whose sum is σ = 18115364232. Its totient is φ = 3067151360.

The previous prime is 8147121109. The next prime is 8147121173. The reversal of 8147121140 is 411217418.

It can be written as a sum of positive squares in 4 ways, for example, as 280495504 + 7866625636 = 16748^2 + 88694^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11980721 + ... + 11981400.

It is an arithmetic number, because the mean of its divisors is an integer number (754806843).

Almost surely, 2^8147121140 is an apocalyptic number.

It is an amenable number.

8147121140 is an abundant number, since it is smaller than the sum of its proper divisors (9968243092).

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

8147121140 is a wasteful number, since it uses less digits than its factorization.

8147121140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23962147 (or 23962145 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 8147121140 is about 90261.4044871893. The cubic root of 8147121140 is about 2012.1856985859.

Adding to 8147121140 its reverse (411217418), we get a palindrome (8558338558).

The spelling of 8147121140 in words is "eight billion, one hundred forty-seven million, one hundred twenty-one thousand, one hundred forty".