218839468621 has 8 divisors (see below), whose sum is σ = 224779230200. Its totient is φ = 212901032448.

The previous prime is 218839468619. The next prime is 218839468633. The reversal of 218839468621 is 126864938812.

It can be written as a sum of positive squares in 4 ways, for example, as 76280363721 + 142559104900 = 276189^2 + 377570^2 .

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 218839468621 - 2¹ = 218839468619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218839468651) 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, 8005 + ... + 661621.

It is an arithmetic number, because the mean of its divisors is an integer number (28097403775).

Almost surely, 2^218839468621 is an apocalyptic number.

It is an amenable number.

218839468621 is a deficient number, since it is larger than the sum of its proper divisors (5939761579).

218839468621 is an equidigital number, since it uses as much as digits as its factorization.

218839468621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662703.

The product of its digits is 7962624, while the sum is 58.

The spelling of 218839468621 in words is "two hundred eighteen billion, eight hundred thirty-nine million, four hundred sixty-eight thousand, six hundred twenty-one".