221213107 has 4 divisors (see below), whose sum is σ = 221610816. Its totient is φ = 220815400.

The previous prime is 221213099. The next prime is 221213123. The reversal of 221213107 is 701312122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221213107 - 2³ = 221213099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221213147) 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 3 ways as a sum of consecutive naturals, for example, 198019 + ... + 199132.

It is an arithmetic number, because the mean of its divisors is an integer number (55402704).

Almost surely, 2^221213107 is an apocalyptic number.

221213107 is a deficient number, since it is larger than the sum of its proper divisors (397709).

221213107 is an equidigital number, since it uses as much as digits as its factorization.

221213107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397708.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 221213107 is about 14873.2345843129. The cubic root of 221213107 is about 604.7886309413.

Adding to 221213107 its reverse (701312122), we get a palindrome (922525229).

The spelling of 221213107 in words is "two hundred twenty-one million, two hundred thirteen thousand, one hundred seven".