221199705 has 12 divisors (see below), whose sum is σ = 383412900. Its totient is φ = 117973152.

The previous prime is 221199701. The next prime is 221199707. The reversal of 221199705 is 507991122.

It can be written as a sum of positive squares in 2 ways, for example, as 111767184 + 109432521 = 10572^2 + 10461^2 .

It is not a de Polignac number, because 221199705 - 2² = 221199701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221199705.

It is not an unprimeable number, because it can be changed into a prime (221199701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2457730 + ... + 2457819.

It is an arithmetic number, because the mean of its divisors is an integer number (31951075).

Almost surely, 2^221199705 is an apocalyptic number.

It is an amenable number.

221199705 is a deficient number, since it is larger than the sum of its proper divisors (162213195).

221199705 is a wasteful number, since it uses less digits than its factorization.

221199705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4915560 (or 4915557 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 221199705 is about 14872.7840366221. The cubic root of 221199705 is about 604.7764171670.

The spelling of 221199705 in words is "two hundred twenty-one million, one hundred ninety-nine thousand, seven hundred five".