221621067 has 6 divisors (see below), whose sum is σ = 320119332. Its totient is φ = 147747372.

The previous prime is 221621063. The next prime is 221621087. The reversal of 221621067 is 760126122.

It is not a de Polignac number, because 221621067 - 2² = 221621063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221621067.

It is not an unprimeable number, because it can be changed into a prime (221621063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12312273 + ... + 12312290.

It is an arithmetic number, because the mean of its divisors is an integer number (53353222).

Almost surely, 2^221621067 is an apocalyptic number.

221621067 is a deficient number, since it is larger than the sum of its proper divisors (98498265).

221621067 is a wasteful number, since it uses less digits than its factorization.

221621067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24624569 (or 24624566 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 221621067 is about 14886.9428359217. The cubic root of 221621067 is about 605.1601852553.

Adding to 221621067 its reverse (760126122), we get a palindrome (981747189).

The spelling of 221621067 in words is "two hundred twenty-one million, six hundred twenty-one thousand, sixty-seven".