221144155 has 8 divisors (see below), whose sum is σ = 266533200. Its totient is φ = 176141856.

The previous prime is 221144129. The next prime is 221144159. The reversal of 221144155 is 551441122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221144155 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221144159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95425 + ... + 97714.

It is an arithmetic number, because the mean of its divisors is an integer number (33316650).

Almost surely, 2^221144155 is an apocalyptic number.

221144155 is a deficient number, since it is larger than the sum of its proper divisors (45389045).

221144155 is a wasteful number, since it uses less digits than its factorization.

221144155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193373.

The product of its digits is 1600, while the sum is 25.

The square root of 221144155 is about 14870.9164142631. The cubic root of 221144155 is about 604.7257869870.

Adding to 221144155 its reverse (551441122), we get a palindrome (772585277).

The spelling of 221144155 in words is "two hundred twenty-one million, one hundred forty-four thousand, one hundred fifty-five".