221991195 has 16 divisors (see below), whose sum is σ = 356039712. Its totient is φ = 118110720.

The previous prime is 221991191. The next prime is 221991221. The reversal of 221991195 is 591199122.

It is not a de Polignac number, because 221991195 - 2² = 221991191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221991191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11262 + ... + 23891.

It is an arithmetic number, because the mean of its divisors is an integer number (22252482).

Almost surely, 2^221991195 is an apocalyptic number.

221991195 is a deficient number, since it is larger than the sum of its proper divisors (134048517).

221991195 is a wasteful number, since it uses less digits than its factorization.

221991195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35582.

The product of its digits is 14580, while the sum is 39.

The square root of 221991195 is about 14899.3689463682. The cubic root of 221991195 is about 605.4968893342.

The spelling of 221991195 in words is "two hundred twenty-one million, nine hundred ninety-one thousand, one hundred ninety-five".