221814436 has 36 divisors (see below), whose sum is σ = 434098000. Its totient is φ = 98879616.

The previous prime is 221814427. The next prime is 221814457. The reversal of 221814436 is 634418122.

221814436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221814398 and 221814407.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16915 + ... + 27013.

Almost surely, 2^221814436 is an apocalyptic number.

It is an amenable number.

221814436 is a deficient number, since it is larger than the sum of its proper divisors (212283564).

221814436 is a wasteful number, since it uses less digits than its factorization.

221814436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156 (or 10137 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 221814436 is about 14893.4360038240. The cubic root of 221814436 is about 605.3361390489.

The spelling of 221814436 in words is "two hundred twenty-one million, eight hundred fourteen thousand, four hundred thirty-six".