8438549899921 has 8 divisors (see below), whose sum is σ = 8974258170080. Its totient is φ = 7911999036288.

The previous prime is 8438549899837. The next prime is 8438549899931. The reversal of 8438549899921 is 1299989458348.

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 8438549899921 - 2²³ = 8438541511313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8438549899931) 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, 2289349731 + ... + 2289353416.

It is an arithmetic number, because the mean of its divisors is an integer number (1121782271260).

Almost surely, 2^{8438549899921} is an apocalyptic number.

It is an amenable number.

8438549899921 is a deficient number, since it is larger than the sum of its proper divisors (535708270159).

8438549899921 is a wasteful number, since it uses less digits than its factorization.

8438549899921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578703263.

The product of its digits is 1612431360, while the sum is 79.

The spelling of 8438549899921 in words is "eight trillion, four hundred thirty-eight billion, five hundred forty-nine million, eight hundred ninety-nine thousand, nine hundred twenty-one".