221215065 has 8 divisors (see below), whose sum is σ = 353944128. Its totient is φ = 117981360.

The previous prime is 221215061. The next prime is 221215069. The reversal of 221215065 is 560512122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221215061) and next prime (221215069).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221215065 - 2² = 221215061 is a prime.

It is a super-2 number, since 2×221215065² = 97872209965908450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221215061) 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 7 ways as a sum of consecutive naturals, for example, 7373821 + ... + 7373850.

It is an arithmetic number, because the mean of its divisors is an integer number (44243016).

Almost surely, 2^221215065 is an apocalyptic number.

It is an amenable number.

221215065 is a deficient number, since it is larger than the sum of its proper divisors (132729063).

221215065 is a wasteful number, since it uses less digits than its factorization.

221215065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14747679.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 221215065 is about 14873.3004071053. The cubic root of 221215065 is about 604.7904153031.

Adding to 221215065 its reverse (560512122), we get a palindrome (781727187).

The spelling of 221215065 in words is "two hundred twenty-one million, two hundred fifteen thousand, sixty-five".