221253218736 has 40 divisors (see below), whose sum is σ = 623531799744. Its totient is φ = 67046429760.

The previous prime is 221253218701. The next prime is 221253218777. The reversal of 221253218736 is 637812352122.

It is a super-2 number, since 2×221253218736² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 209519566 + ... + 209520621.

Almost surely, 2^221253218736 is an apocalyptic number.

It is an amenable number.

221253218736 is an abundant number, since it is smaller than the sum of its proper divisors (402278581008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221253218736 is a wasteful number, since it uses less digits than its factorization.

221253218736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419040209 (or 419040203 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The spelling of 221253218736 in words is "two hundred twenty-one billion, two hundred fifty-three million, two hundred eighteen thousand, seven hundred thirty-six".