221214755 has 16 divisors (see below), whose sum is σ = 275425920. Its totient is φ = 170362752.

The previous prime is 221214743. The next prime is 221214757. The reversal of 221214755 is 557412122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221214755 - 2⁶ = 221214691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (221214757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51137 + ... + 55293.

It is an arithmetic number, because the mean of its divisors is an integer number (17214120).

Almost surely, 2^221214755 is an apocalyptic number.

221214755 is a deficient number, since it is larger than the sum of its proper divisors (54211165).

221214755 is a wasteful number, since it uses less digits than its factorization.

221214755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4558.

The product of its digits is 5600, while the sum is 29.

The square root of 221214755 is about 14873.2899857429. The cubic root of 221214755 is about 604.7901327951.

Adding to 221214755 its reverse (557412122), we get a palindrome (778626877).

The spelling of 221214755 in words is "two hundred twenty-one million, two hundred fourteen thousand, seven hundred fifty-five".