7721047321 has 8 divisors (see below), whose sum is σ = 8321258624. Its totient is φ = 7121733840.

The previous prime is 7721047291. The next prime is 7721047339. The reversal of 7721047321 is 1237401277.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7721047321 - 2⁷ = 7721047193 is a prime.

It is a super-2 number, since 2×7721047321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7721047351) 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 7 ways as a sum of consecutive naturals, for example, 206535 + ... + 241036.

It is an arithmetic number, because the mean of its divisors is an integer number (1040157328).

Almost surely, 2^7721047321 is an apocalyptic number.

It is an amenable number.

7721047321 is a deficient number, since it is larger than the sum of its proper divisors (600211303).

7721047321 is a wasteful number, since it uses less digits than its factorization.

7721047321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448911.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 7721047321 is about 87869.4902739284. The cubic root of 7721047321 is about 1976.4783949395.

Adding to 7721047321 its reverse (1237401277), we get a palindrome (8958448598).

The spelling of 7721047321 in words is "seven billion, seven hundred twenty-one million, forty-seven thousand, three hundred twenty-one".