221432438 has 8 divisors (see below), whose sum is σ = 332477040. Its totient is φ = 110606760.

The previous prime is 221432437. The next prime is 221432459. The reversal of 221432438 is 834234122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221432438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221432437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52178 + ... + 56261.

It is an arithmetic number, because the mean of its divisors is an integer number (41559630).

Almost surely, 2^221432438 is an apocalyptic number.

221432438 is a deficient number, since it is larger than the sum of its proper divisors (111044602).

221432438 is a wasteful number, since it uses less digits than its factorization.

221432438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109462.

The product of its digits is 9216, while the sum is 29.

The square root of 221432438 is about 14880.6061032473. The cubic root of 221432438 is about 604.9884459237.

The spelling of 221432438 in words is "two hundred twenty-one million, four hundred thirty-two thousand, four hundred thirty-eight".