221012197 has 12 divisors (see below), whose sum is σ = 258742380. Its totient is φ = 188225856.

The previous prime is 221012191. The next prime is 221012201. The reversal of 221012197 is 791210122.

It can be written as a sum of positive squares in 2 ways, for example, as 73170916 + 147841281 = 8554^2 + 12159^2 .

It is not a de Polignac number, because 221012197 - 2⁷ = 221012069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6672 + ... + 22057.

It is an arithmetic number, because the mean of its divisors is an integer number (21561865).

Almost surely, 2^221012197 is an apocalyptic number.

It is an amenable number.

221012197 is a deficient number, since it is larger than the sum of its proper divisors (37730183).

221012197 is a wasteful number, since it uses less digits than its factorization.

221012197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28900 (or 28893 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 221012197 is about 14866.4789711619. The cubic root of 221012197 is about 604.6054819267.

The spelling of 221012197 in words is "two hundred twenty-one million, twelve thousand, one hundred ninety-seven".