7240253356321 has 4 divisors (see below), whose sum is σ = 7240277261700. Its totient is φ = 7240229450944.

The previous prime is 7240253356289. The next prime is 7240253356361. The reversal of 7240253356321 is 1236533520427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 814352832225 + 6425900524096 = 902415^2 + 2534936^2 .

It is a cyclic number.

It is not a de Polignac number, because 7240253356321 - 2⁵ = 7240253356289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7240253356361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11492476 + ... + 12106093.

It is an arithmetic number, because the mean of its divisors is an integer number (1810069315425).

Almost surely, 2^{7240253356321} is an apocalyptic number.

It is an amenable number.

7240253356321 is a deficient number, since it is larger than the sum of its proper divisors (23905379).

7240253356321 is a wasteful number, since it uses less digits than its factorization.

7240253356321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23905378.

The product of its (nonzero) digits is 907200, while the sum is 43.

Adding to 7240253356321 its reverse (1236533520427), we get a palindrome (8476786876748).

The spelling of 7240253356321 in words is "seven trillion, two hundred forty billion, two hundred fifty-three million, three hundred fifty-six thousand, three hundred twenty-one".