7730810221 has 16 divisors (see below), whose sum is σ = 7900402176. Its totient is φ = 7563150000.

The previous prime is 7730810201. The next prime is 7730810239. The reversal of 7730810221 is 1220180377.

It is a 5-Lehmer number, since φ(7730810221) divides (7730810221-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 7730810221 - 2⁷ = 7730810093 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 (7730810201) by changing a digit.

It is a Zeisel number, with parameters (2, 69).

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 in 15 ways as a sum of consecutive naturals, for example, 7355146 + ... + 7356196.

It is an arithmetic number, because the mean of its divisors is an integer number (493775136).

Almost surely, 2^7730810221 is an apocalyptic number.

7730810221 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7730810221 is a deficient number, since it is larger than the sum of its proper divisors (169591955).

7730810221 is a wasteful number, since it uses less digits than its factorization.

7730810221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 7730810221 is about 87925.0261359074. The cubic root of 7730810221 is about 1977.3110986217.

Adding to 7730810221 its reverse (1220180377), we get a palindrome (8950990598).

The spelling of 7730810221 in words is "seven billion, seven hundred thirty million, eight hundred ten thousand, two hundred twenty-one".