621218238824 has 16 divisors (see below), whose sum is σ = 1180740146820. Its totient is φ = 306354199680.

The previous prime is 621218238821. The next prime is 621218238853. The reversal of 621218238824 is 428832812126.

It can be written as a sum of positive squares in 2 ways, for example, as 606189930724 + 15028308100 = 778582^2 + 122590^2 .

It is not an unprimeable number, because it can be changed into a prime (621218238821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531864347 + ... + 531865514.

Almost surely, 2^621218238824 is an apocalyptic number.

It is an amenable number.

621218238824 is a deficient number, since it is larger than the sum of its proper divisors (559521907996).

621218238824 is a wasteful number, since it uses less digits than its factorization.

621218238824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063729940 (or 1063729936 counting only the distinct ones).

The product of its digits is 589824, while the sum is 47.

The spelling of 621218238824 in words is "six hundred twenty-one billion, two hundred eighteen million, two hundred thirty-eight thousand, eight hundred twenty-four".