7130721600000 has 600 divisors, whose sum is σ = 26602938810756. Its totient is φ = 1901491200000.

The previous prime is 7130721599977. The next prime is 7130721600001. The reversal of 7130721600000 is 61270317.

7130721600000 is a `hidden beast` number, since 7 + 1 + 30 + 7 + 21 + 600 + 0 + 0 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1459998556416 + 5670723043584 = 1208304^2 + 2381328^2 .

It is a tau number, because it is divible by the number of its divisors (600).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (7130721600001) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 129572490 + ... + 129627510.

Almost surely, 2^{7130721600000} 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 7130721600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13301469405378).

7130721600000 is an abundant number, since it is smaller than the sum of its proper divisors (19472217210756).

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

7130721600000 is an frugal number, since it uses more digits than its factorization.

7130721600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55076 (or 55031 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

Adding to 7130721600000 its reverse (61270317), we get a palindrome (7130782870317).

The spelling of 7130721600000 in words is "seven trillion, one hundred thirty billion, seven hundred twenty-one million, six hundred thousand".