9947989321 has 4 divisors (see below), whose sum is σ = 10014754500. Its totient is φ = 9881224144.

The previous prime is 9947989307. The next prime is 9947989339. The reversal of 9947989321 is 1239897499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1239897499 = 17 ⋅72935147.

It can be written as a sum of positive squares in 2 ways, for example, as 6530417721 + 3417571600 = 80811^2 + 58460^2 .

It is a cyclic number.

It is not a de Polignac number, because 9947989321 - 2¹³ = 9947981129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9947989321.

It is not an unprimeable number, because it can be changed into a prime (9947989301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33382366 + ... + 33382663.

It is an arithmetic number, because the mean of its divisors is an integer number (2503688625).

Almost surely, 2^9947989321 is an apocalyptic number.

It is an amenable number.

9947989321 is a deficient number, since it is larger than the sum of its proper divisors (66765179).

9947989321 is a wasteful number, since it uses less digits than its factorization.

9947989321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66765178.

The product of its digits is 8817984, while the sum is 61.

The square root of 9947989321 is about 99739.6075839483. The cubic root of 9947989321 is about 2150.6930753479.

The spelling of 9947989321 in words is "nine billion, nine hundred forty-seven million, nine hundred eighty-nine thousand, three hundred twenty-one".