7281131421 has 16 divisors (see below), whose sum is σ = 9769089024. Its totient is φ = 4823724864.

The previous prime is 7281131419. The next prime is 7281131423. The reversal of 7281131421 is 1241311827.

It is an interprime number because it is at equal distance from previous prime (7281131419) and next prime (7281131423).

It is not a de Polignac number, because 7281131421 - 2¹ = 7281131419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7281131423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306835 + ... + 329711.

It is an arithmetic number, because the mean of its divisors is an integer number (610568064).

Almost surely, 2^7281131421 is an apocalyptic number.

It is an amenable number.

7281131421 is a deficient number, since it is larger than the sum of its proper divisors (2487957603).

7281131421 is a wasteful number, since it uses less digits than its factorization.

7281131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23540.

The product of its digits is 2688, while the sum is 30.

The square root of 7281131421 is about 85329.5460025424. The cubic root of 7281131421 is about 1938.2046149569.

The spelling of 7281131421 in words is "seven billion, two hundred eighty-one million, one hundred thirty-one thousand, four hundred twenty-one".