7421288722321 has 4 divisors (see below), whose sum is σ = 7429712433444. Its totient is φ = 7412865011200.

The previous prime is 7421288722279. The next prime is 7421288722333. The reversal of 7421288722321 is 1232278821247.

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 3205818630400 + 4215470091921 = 1790480^2 + 2053161^2 .

It is a cyclic number.

It is not a de Polignac number, because 7421288722321 - 2¹³ = 7421288714129 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7421288722391) 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, 4211854240 + ... + 4211856001.

It is an arithmetic number, because the mean of its divisors is an integer number (1857428108361).

Almost surely, 2^{7421288722321} is an apocalyptic number.

It is an amenable number.

7421288722321 is a deficient number, since it is larger than the sum of its proper divisors (8423711123).

7421288722321 is an equidigital number, since it uses as much as digits as its factorization.

7421288722321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8423711122.

The product of its digits is 1204224, while the sum is 49.

The spelling of 7421288722321 in words is "seven trillion, four hundred twenty-one billion, two hundred eighty-eight million, seven hundred twenty-two thousand, three hundred twenty-one".