221982416978 has 32 divisors (see below), whose sum is σ = 404349957504. Its totient is φ = 89222706432.

The previous prime is 221982416963. The next prime is 221982416989. The reversal of 221982416978 is 879614289122.

221982416978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1580525 + ... + 1715232.

It is an arithmetic number, because the mean of its divisors is an integer number (12635936172).

Almost surely, 2^221982416978 is an apocalyptic number.

221982416978 is a deficient number, since it is larger than the sum of its proper divisors (182367540526).

221982416978 is a wasteful number, since it uses less digits than its factorization.

221982416978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296066.

The product of its digits is 6967296, while the sum is 59.

The spelling of 221982416978 in words is "two hundred twenty-one billion, nine hundred eighty-two million, four hundred sixteen thousand, nine hundred seventy-eight".