221034215 has 16 divisors (see below), whose sum is σ = 269107488. Its totient is φ = 174268416.

The previous prime is 221034211. The next prime is 221034223. The reversal of 221034215 is 512430122.

It is a cyclic number.

It is not a de Polignac number, because 221034215 - 2² = 221034211 is a prime.

It is a super-2 number, since 2×221034215² = 97712248401332450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221034211) 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 15 ways as a sum of consecutive naturals, for example, 108032 + ... + 110058.

It is an arithmetic number, because the mean of its divisors is an integer number (16819218).

Almost surely, 2^221034215 is an apocalyptic number.

221034215 is a deficient number, since it is larger than the sum of its proper divisors (48073273).

221034215 is a wasteful number, since it uses less digits than its factorization.

221034215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 221034215 is about 14867.2194777638. The cubic root of 221034215 is about 604.6255588902.

Adding to 221034215 its reverse (512430122), we get a palindrome (733464337).

The spelling of 221034215 in words is "two hundred twenty-one million, thirty-four thousand, two hundred fifteen".