221350785 has 16 divisors (see below), whose sum is σ = 354352320. Its totient is φ = 117990080.

The previous prime is 221350771. The next prime is 221350813. The reversal of 221350785 is 587053122.

It is not a de Polignac number, because 221350785 - 2⁸ = 221350529 is a prime.

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, 41575 + ... + 46595.

It is an arithmetic number, because the mean of its divisors is an integer number (22147020).

Almost surely, 2^221350785 is an apocalyptic number.

It is an amenable number.

221350785 is a deficient number, since it is larger than the sum of its proper divisors (133001535).

221350785 is a wasteful number, since it uses less digits than its factorization.

221350785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7968.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 221350785 is about 14877.8622456319. The cubic root of 221350785 is about 604.9140738109.

The spelling of 221350785 in words is "two hundred twenty-one million, three hundred fifty thousand, seven hundred eighty-five".