7345421521 has 2 divisors, whose sum is σ = 7345421522. Its totient is φ = 7345421520.

The previous prime is 7345421491. The next prime is 7345421533. The reversal of 7345421521 is 1251245437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5262777025 + 2082644496 = 72545^2 + 45636^2 .

It is a cyclic number.

It is not a de Polignac number, because 7345421521 - 2¹⁵ = 7345388753 is a prime.

It is not a weakly prime, because it can be changed into another prime (7345421021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3672710760 + 3672710761.

It is an arithmetic number, because the mean of its divisors is an integer number (3672710761).

Almost surely, 2^7345421521 is an apocalyptic number.

It is an amenable number.

7345421521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7345421521 is an equidigital number, since it uses as much as digits as its factorization.

7345421521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 34.

The square root of 7345421521 is about 85705.4346059805. The cubic root of 7345421521 is about 1943.8924859710.

Adding to 7345421521 its reverse (1251245437), we get a palindrome (8596666958).

The spelling of 7345421521 in words is "seven billion, three hundred forty-five million, four hundred twenty-one thousand, five hundred twenty-one".