221161208 has 8 divisors (see below), whose sum is σ = 414677280. Its totient is φ = 110580600.

The previous prime is 221161201. The next prime is 221161231. The reversal of 221161208 is 802161122.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221161201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13822568 + ... + 13822583.

It is an arithmetic number, because the mean of its divisors is an integer number (51834660).

Almost surely, 2^221161208 is an apocalyptic number.

It is an amenable number.

221161208 is a deficient number, since it is larger than the sum of its proper divisors (193516072).

221161208 is a wasteful number, since it uses less digits than its factorization.

221161208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27645157 (or 27645153 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 221161208 is about 14871.4897706988. The cubic root of 221161208 is about 604.7413305793.

The spelling of 221161208 in words is "two hundred twenty-one million, one hundred sixty-one thousand, two hundred eight".