221909785904 has 40 divisors (see below), whose sum is σ = 452615130480. Its totient is φ = 105106809600.

The previous prime is 221909785891. The next prime is 221909785943. The reversal of 221909785904 is 409587909122.

It is a self number, because there is not a number n which added to its sum of digits gives 221909785904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5592374 + ... + 5631914.

It is an arithmetic number, because the mean of its divisors is an integer number (11315378262).

Almost surely, 2^221909785904 is an apocalyptic number.

It is an amenable number.

221909785904 is an abundant number, since it is smaller than the sum of its proper divisors (230705344576).

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

221909785904 is a wasteful number, since it uses less digits than its factorization.

221909785904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58029 (or 58023 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 221909785904 in words is "two hundred twenty-one billion, nine hundred nine million, seven hundred eighty-five thousand, nine hundred four".