221852978 has 8 divisors (see below), whose sum is σ = 333096300. Its totient is φ = 110820880.

The previous prime is 221852977. The next prime is 221852989. The reversal of 221852978 is 879258122.

221852978 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 221801449 + 51529 = 14893^2 + 227^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221852977) 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, 50153 + ... + 54396.

Almost surely, 2^221852978 is an apocalyptic number.

221852978 is a deficient number, since it is larger than the sum of its proper divisors (111243322).

221852978 is a wasteful number, since it uses less digits than its factorization.

221852978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105612.

The product of its digits is 161280, while the sum is 44.

The square root of 221852978 is about 14894.7298733478. The cubic root of 221852978 is about 605.3711976542.

The spelling of 221852978 in words is "two hundred twenty-one million, eight hundred fifty-two thousand, nine hundred seventy-eight".