221263215 has 16 divisors (see below), whose sum is σ = 355373568. Its totient is φ = 117556256.

The previous prime is 221263139. The next prime is 221263223. The reversal of 221263215 is 512362122.

It is a cyclic number.

It is not a de Polignac number, because 221263215 - 2⁹ = 221262703 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24099 + ... + 31988.

It is an arithmetic number, because the mean of its divisors is an integer number (22210848).

Almost surely, 2^221263215 is an apocalyptic number.

221263215 is a deficient number, since it is larger than the sum of its proper divisors (134110353).

221263215 is a wasteful number, since it uses less digits than its factorization.

221263215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56358.

The product of its digits is 1440, while the sum is 24.

The square root of 221263215 is about 14874.9189913761. The cubic root of 221263215 is about 604.8342919802.

The spelling of 221263215 in words is "two hundred twenty-one million, two hundred sixty-three thousand, two hundred fifteen".