7422125521 has 4 divisors (see below), whose sum is σ = 7423131492. Its totient is φ = 7421119552.

The previous prime is 7422125497. The next prime is 7422125549. The reversal of 7422125521 is 1255212247.

It is a happy number.

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 2864390400 + 4557735121 = 53520^2 + 67511^2 .

It is a cyclic number.

It is not a de Polignac number, because 7422125521 - 2⁷ = 7422125393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7422126521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491836 + ... + 506701.

It is an arithmetic number, because the mean of its divisors is an integer number (1855782873).

Almost surely, 2^7422125521 is an apocalyptic number.

It is an amenable number.

7422125521 is a deficient number, since it is larger than the sum of its proper divisors (1005971).

7422125521 is an equidigital number, since it uses as much as digits as its factorization.

7422125521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005970.

The product of its digits is 11200, while the sum is 31.

The square root of 7422125521 is about 86151.7586645798. The cubic root of 7422125521 is about 1950.6353854055.

Adding to 7422125521 its reverse (1255212247), we get a palindrome (8677337768).

The spelling of 7422125521 in words is "seven billion, four hundred twenty-two million, one hundred twenty-five thousand, five hundred twenty-one".