221440439 has 4 divisors (see below), whose sum is σ = 241571400. Its totient is φ = 201309480.

The previous prime is 221440423. The next prime is 221440447. The reversal of 221440439 is 934044122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221440439 - 2⁴ = 221440423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221440469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10065464 + ... + 10065485.

It is an arithmetic number, because the mean of its divisors is an integer number (60392850).

Almost surely, 2^221440439 is an apocalyptic number.

221440439 is a deficient number, since it is larger than the sum of its proper divisors (20130961).

221440439 is a wasteful number, since it uses less digits than its factorization.

221440439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20130960.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 221440439 is about 14880.8749406747. The cubic root of 221440439 is about 604.9957325018.

The spelling of 221440439 in words is "two hundred twenty-one million, four hundred forty thousand, four hundred thirty-nine".