221161854 has 24 divisors (see below), whose sum is σ = 449990280. Its totient is φ = 72464272.

The previous prime is 221161849. The next prime is 221161861. The reversal of 221161854 is 458161122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15592 + ... + 26180.

It is an arithmetic number, because the mean of its divisors is an integer number (18749595).

Almost surely, 2^221161854 is an apocalyptic number.

221161854 is an abundant number, since it is smaller than the sum of its proper divisors (228828426).

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

221161854 is a wasteful number, since it uses less digits than its factorization.

221161854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712 (or 10653 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 221161854 is about 14871.5114900941. The cubic root of 221161854 is about 604.7419193844.

The spelling of 221161854 in words is "two hundred twenty-one million, one hundred sixty-one thousand, eight hundred fifty-four".