221085478 has 4 divisors (see below), whose sum is σ = 331628220. Its totient is φ = 110542738.

The previous prime is 221085467. The next prime is 221085497. The reversal of 221085478 is 874580122.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 55271368 + ... + 55271371.

It is an arithmetic number, because the mean of its divisors is an integer number (82907055).

Almost surely, 2^221085478 is an apocalyptic number.

221085478 is a deficient number, since it is larger than the sum of its proper divisors (110542742).

221085478 is a wasteful number, since it uses less digits than its factorization.

221085478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110542741.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 221085478 is about 14868.9434056358. The cubic root of 221085478 is about 604.6722975428.

The spelling of 221085478 in words is "two hundred twenty-one million, eighty-five thousand, four hundred seventy-eight".