7972984823921 has 8 divisors (see below), whose sum is σ = 8586318906984. Its totient is φ = 7359654677760.

The previous prime is 7972984823851. The next prime is 7972984823927. The reversal of 7972984823921 is 1293284892797.

It can be written as a sum of positive squares in 4 ways, for example, as 535970410000 + 7437014413921 = 732100^2 + 2727089^2 .

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 7972984823921 - 2²² = 7972980629617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7972984823927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4254875 + ... + 5835231.

It is an arithmetic number, because the mean of its divisors is an integer number (1073289863373).

Almost surely, 2^{7972984823921} is an apocalyptic number.

It is an amenable number.

7972984823921 is a deficient number, since it is larger than the sum of its proper divisors (613334083063).

7972984823921 is a wasteful number, since it uses less digits than its factorization.

7972984823921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968451.

The product of its digits is 219469824, while the sum is 71.

The spelling of 7972984823921 in words is "seven trillion, nine hundred seventy-two billion, nine hundred eighty-four million, eight hundred twenty-three thousand, nine hundred twenty-one".