221821983474 has 64 divisors (see below), whose sum is σ = 563637043200. Its totient is φ = 56615319360.

The previous prime is 221821983407. The next prime is 221821983517. The reversal of 221821983474 is 474389128122.

It is a happy number.

221821983474 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6535774 + ... + 6569625.

It is an arithmetic number, because the mean of its divisors is an integer number (8806828800).

Almost surely, 2^221821983474 is an apocalyptic number.

221821983474 is an abundant number, since it is smaller than the sum of its proper divisors (341815059726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221821983474 is a wasteful number, since it uses less digits than its factorization.

221821983474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13105455.

The product of its digits is 1548288, while the sum is 51.

The spelling of 221821983474 in words is "two hundred twenty-one billion, eight hundred twenty-one million, nine hundred eighty-three thousand, four hundred seventy-four".