7242116521 has 2 divisors, whose sum is σ = 7242116522. Its totient is φ = 7242116520.

The previous prime is 7242116509. The next prime is 7242116543. The reversal of 7242116521 is 1256112427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7113066921 + 129049600 = 84339^2 + 11360^2 .

It is a cyclic number.

It is not a de Polignac number, because 7242116521 - 2²⁷ = 7107898793 is a prime.

It is a super-2 number, since 2×7242116521² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7242116821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3621058260 + 3621058261.

It is an arithmetic number, because the mean of its divisors is an integer number (3621058261).

Almost surely, 2^7242116521 is an apocalyptic number.

It is an amenable number.

7242116521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7242116521 is an equidigital number, since it uses as much as digits as its factorization.

7242116521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 7242116521 is about 85100.6258555130. The cubic root of 7242116521 is about 1934.7365492293.

Adding to 7242116521 its reverse (1256112427), we get a palindrome (8498228948).

The spelling of 7242116521 in words is "seven billion, two hundred forty-two million, one hundred sixteen thousand, five hundred twenty-one".