3520240621 has 2 divisors, whose sum is σ = 3520240622. Its totient is φ = 3520240620.

The previous prime is 3520240601. The next prime is 3520240627. The reversal of 3520240621 is 1260420253.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3519455625 + 784996 = 59325^2 + 886^2 .

It is an emirp because it is prime and its reverse (1260420253) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3520240621 - 2⁹ = 3520240109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3520240627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760120310 + 1760120311.

It is an arithmetic number, because the mean of its divisors is an integer number (1760120311).

Almost surely, 2^3520240621 is an apocalyptic number.

It is an amenable number.

3520240621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3520240621 is an equidigital number, since it uses as much as digits as its factorization.

3520240621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 3520240621 is about 59331.6156951755. The cubic root of 3520240621 is about 1521.2156452657.

Adding to 3520240621 its reverse (1260420253), we get a palindrome (4780660874).

The spelling of 3520240621 in words is "three billion, five hundred twenty million, two hundred forty thousand, six hundred twenty-one".