221440351 has 8 divisors (see below), whose sum is σ = 255781584. Its totient is φ = 189467520.

The previous prime is 221440321. The next prime is 221440381. The reversal of 221440351 is 153044122.

It is an interprime number because it is at equal distance from previous prime (221440321) and next prime (221440381).

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

It is not a de Polignac number, because 221440351 - 2⁵ = 221440319 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 (221440321) 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 7 ways as a sum of consecutive naturals, for example, 591900 + ... + 592273.

It is an arithmetic number, because the mean of its divisors is an integer number (31972698).

Almost surely, 2^221440351 is an apocalyptic number.

221440351 is a deficient number, since it is larger than the sum of its proper divisors (34341233).

221440351 is a wasteful number, since it uses less digits than its factorization.

221440351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184201.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 221440351 is about 14880.8719838590. The cubic root of 221440351 is about 604.9956523604.

Adding to 221440351 its reverse (153044122), we get a palindrome (374484473).

The spelling of 221440351 in words is "two hundred twenty-one million, four hundred forty thousand, three hundred fifty-one".