221454436 has 12 divisors (see below), whose sum is σ = 442908928. Its totient is φ = 94909032.

The previous prime is 221454403. The next prime is 221454437. The reversal of 221454436 is 634454122.

221454436 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 221454398 and 221454407.

It is not an unprimeable number, because it can be changed into a prime (221454437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3954516 + ... + 3954571.

Almost surely, 2^221454436 is an apocalyptic number.

It is an amenable number.

221454436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221454436 is a wasteful number, since it uses less digits than its factorization.

221454436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7909098 (or 7909096 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

The square root of 221454436 is about 14881.3452348906. The cubic root of 221454436 is about 605.0084792655.

The spelling of 221454436 in words is "two hundred twenty-one million, four hundred fifty-four thousand, four hundred thirty-six".