221642063 has 4 divisors (see below), whose sum is σ = 221756040. Its totient is φ = 221528088.

The previous prime is 221642059. The next prime is 221642077. The reversal of 221642063 is 360246122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 360246122 = 2 ⋅180123061.

It is a cyclic number.

It is not a de Polignac number, because 221642063 - 2² = 221642059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221612063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54020 + ... + 57977.

It is an arithmetic number, because the mean of its divisors is an integer number (55439010).

Almost surely, 2^221642063 is an apocalyptic number.

221642063 is a deficient number, since it is larger than the sum of its proper divisors (113977).

221642063 is a wasteful number, since it uses less digits than its factorization.

221642063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113976.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 221642063 is about 14887.6480009436. The cubic root of 221642063 is about 605.1792952647.

Adding to 221642063 its reverse (360246122), we get a palindrome (581888185).

The spelling of 221642063 in words is "two hundred twenty-one million, six hundred forty-two thousand, sixty-three".