221971196 has 6 divisors (see below), whose sum is σ = 388449600. Its totient is φ = 110985596.

The previous prime is 221971187. The next prime is 221971199. The reversal of 221971196 is 691179122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221971199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27746396 + ... + 27746403.

It is an arithmetic number, because the mean of its divisors is an integer number (64741600).

Almost surely, 2^221971196 is an apocalyptic number.

It is an amenable number.

221971196 is a deficient number, since it is larger than the sum of its proper divisors (166478404).

221971196 is a wasteful number, since it uses less digits than its factorization.

221971196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55492803 (or 55492801 counting only the distinct ones).

The product of its digits is 13608, while the sum is 38.

The square root of 221971196 is about 14898.6977954451. The cubic root of 221971196 is about 605.4787058863.

The spelling of 221971196 in words is "two hundred twenty-one million, nine hundred seventy-one thousand, one hundred ninety-six".