918584621921 has 8 divisors (see below), whose sum is σ = 923408271744. Its totient is φ = 913771517040.

The previous prime is 918584621869. The next prime is 918584621971. The reversal of 918584621921 is 129126485819.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918584621921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918584621971) 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, 2461526 + ... + 2810031.

It is an arithmetic number, because the mean of its divisors is an integer number (115426033968).

Almost surely, 2^918584621921 is an apocalyptic number.

It is an amenable number.

918584621921 is a deficient number, since it is larger than the sum of its proper divisors (4823649823).

918584621921 is a wasteful number, since it uses less digits than its factorization.

918584621921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5272471.

The product of its digits is 2488320, while the sum is 56.

The spelling of 918584621921 in words is "nine hundred eighteen billion, five hundred eighty-four million, six hundred twenty-one thousand, nine hundred twenty-one".