221479463 has 4 divisors (see below), whose sum is σ = 226191840. Its totient is φ = 216767088.

The previous prime is 221479439. The next prime is 221479477. The reversal of 221479463 is 364974122.

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 221479463 - 2⁶ = 221479399 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 (221479483) 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 3 ways as a sum of consecutive naturals, for example, 2356118 + ... + 2356211.

It is an arithmetic number, because the mean of its divisors is an integer number (56547960).

Almost surely, 2^221479463 is an apocalyptic number.

221479463 is a deficient number, since it is larger than the sum of its proper divisors (4712377).

221479463 is an equidigital number, since it uses as much as digits as its factorization.

221479463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712376.

The product of its digits is 72576, while the sum is 38.

The square root of 221479463 is about 14882.1860961352. The cubic root of 221479463 is about 605.0312694718.

The spelling of 221479463 in words is "two hundred twenty-one million, four hundred seventy-nine thousand, four hundred sixty-three".