7216115621 has 24 divisors (see below), whose sum is σ = 8972943840. Its totient is φ = 5736744000.

The previous prime is 7216115581. The next prime is 7216115663. The reversal of 7216115621 is 1265116127.

It is a de Polignac number, because none of the positive numbers 2^k-7216115621 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 (7216111621) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 66830 + ... + 137471.

It is an arithmetic number, because the mean of its divisors is an integer number (373872660).

Almost surely, 2^7216115621 is an apocalyptic number.

It is an amenable number.

7216115621 is a deficient number, since it is larger than the sum of its proper divisors (1756828219).

7216115621 is a wasteful number, since it uses less digits than its factorization.

7216115621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204357 (or 204344 counting only the distinct ones).

The product of its digits is 5040, while the sum is 32.

The square root of 7216115621 is about 84947.7228711871. The cubic root of 7216115621 is about 1932.4183864892.

The spelling of 7216115621 in words is "seven billion, two hundred sixteen million, one hundred fifteen thousand, six hundred twenty-one".