7256240221 has 16 divisors (see below), whose sum is σ = 7418062080. Its totient is φ = 7096636800.

The previous prime is 7256240179. The next prime is 7256240227. The reversal of 7256240221 is 1220426527.

It is a cyclic number.

It is not a de Polignac number, because 7256240221 - 2²¹ = 7254143069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7256240227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3533431 + ... + 3535483.

It is an arithmetic number, because the mean of its divisors is an integer number (463628880).

Almost surely, 2^7256240221 is an apocalyptic number.

It is an amenable number.

7256240221 is a deficient number, since it is larger than the sum of its proper divisors (161821859).

7256240221 is a wasteful number, since it uses less digits than its factorization.

7256240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 7256240221 is about 85183.5677874553. The cubic root of 7256240221 is about 1935.9934513195.

Adding to 7256240221 its reverse (1220426527), we get a palindrome (8476666748).

The spelling of 7256240221 in words is "seven billion, two hundred fifty-six million, two hundred forty thousand, two hundred twenty-one".