221446464 has 28 divisors (see below), whose sum is σ = 585910944. Its totient is φ = 73815424.

The previous prime is 221446447. The next prime is 221446481. The reversal of 221446464 is 464644122.

221446464 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (221446447) and next prime (221446481).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576492 + ... + 576875.

Almost surely, 2^221446464 is an apocalyptic number.

221446464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221446464 is an abundant number, since it is smaller than the sum of its proper divisors (364464480).

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

221446464 is a wasteful number, since it uses less digits than its factorization.

221446464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153382 (or 1153372 counting only the distinct ones).

The product of its digits is 36864, while the sum is 33.

The square root of 221446464 is about 14881.0773803512. The cubic root of 221446464 is about 605.0012194042.

The spelling of 221446464 in words is "two hundred twenty-one million, four hundred forty-six thousand, four hundred sixty-four".