221944197 has 24 divisors (see below), whose sum is σ = 315821952. Its totient is φ = 138611200.

The previous prime is 221944183. The next prime is 221944201. The reversal of 221944197 is 791449122.

221944197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221944197 - 2¹⁰ = 221943173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221944117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243172 + ... + 244082.

It is an arithmetic number, because the mean of its divisors is an integer number (13159248).

Almost surely, 2^221944197 is an apocalyptic number.

It is an amenable number.

221944197 is a deficient number, since it is larger than the sum of its proper divisors (93877755).

221944197 is a wasteful number, since it uses less digits than its factorization.

221944197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1212 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 221944197 is about 14897.7916819910. The cubic root of 221944197 is about 605.4541561809.

The spelling of 221944197 in words is "two hundred twenty-one million, nine hundred forty-four thousand, one hundred ninety-seven".