7072215621521 has 8 divisors (see below), whose sum is σ = 7309052889600. Its totient is φ = 6835922183520.

The previous prime is 7072215621517. The next prime is 7072215621571. The reversal of 7072215621521 is 1251265122707.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 7072215621521 - 2² = 7072215621517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7072215621571) 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 7 ways as a sum of consecutive naturals, for example, 135931076 + ... + 135983093.

It is an arithmetic number, because the mean of its divisors is an integer number (913631611200).

Almost surely, 2^{7072215621521} is an apocalyptic number.

It is an amenable number.

7072215621521 is a deficient number, since it is larger than the sum of its proper divisors (236837268079).

7072215621521 is a wasteful number, since it uses less digits than its factorization.

7072215621521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271915039.

The product of its (nonzero) digits is 117600, while the sum is 41.

The spelling of 7072215621521 in words is "seven trillion, seventy-two billion, two hundred fifteen million, six hundred twenty-one thousand, five hundred twenty-one".