8121245340 has 96 divisors (see below), whose sum is σ = 24575878656. Its totient is φ = 1991957760.

The previous prime is 8121245311. The next prime is 8121245357. The reversal of 8121245340 is 435421218.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 8121245298 and 8121245307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202345 + ... + 239135.

It is an arithmetic number, because the mean of its divisors is an integer number (255998736).

Almost surely, 2^8121245340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8121245340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12287939328).

8121245340 is an abundant number, since it is smaller than the sum of its proper divisors (16454633316).

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

8121245340 is a wasteful number, since it uses less digits than its factorization.

8121245340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37099 (or 37097 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 8121245340 is about 90117.9523735421. The cubic root of 8121245340 is about 2010.0531606444.

Adding to 8121245340 its reverse (435421218), we get a palindrome (8556666558).

It can be divided in two parts, 81 and 21245340, that added together give a triangular number (21245421 = T₆₅₁₈).

The spelling of 8121245340 in words is "eight billion, one hundred twenty-one million, two hundred forty-five thousand, three hundred forty".