221823464 has 32 divisors (see below), whose sum is σ = 420420000. Its totient is φ = 109719360.

The previous prime is 221823457. The next prime is 221823467. The reversal of 221823464 is 464328122.

It is a self number, because there is not a number n which added to its sum of digits gives 221823464.

It is not an unprimeable number, because it can be changed into a prime (221823467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444287 + ... + 444785.

It is an arithmetic number, because the mean of its divisors is an integer number (13138125).

Almost surely, 2^221823464 is an apocalyptic number.

It is an amenable number.

221823464 is a deficient number, since it is larger than the sum of its proper divisors (198596536).

221823464 is a wasteful number, since it uses less digits than its factorization.

221823464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993 (or 989 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The square root of 221823464 is about 14893.7390872809. The cubic root of 221823464 is about 605.3443514698.

The spelling of 221823464 in words is "two hundred twenty-one million, eight hundred twenty-three thousand, four hundred sixty-four".