221117242 has 4 divisors (see below), whose sum is σ = 331675866. Its totient is φ = 110558620.

The previous prime is 221117227. The next prime is 221117243. The reversal of 221117242 is 242711122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 168714121 + 52403121 = 12989^2 + 7239^2 .

It is not an unprimeable number, because it can be changed into a prime (221117243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55279309 + ... + 55279312.

Almost surely, 2^221117242 is an apocalyptic number.

221117242 is a deficient number, since it is larger than the sum of its proper divisors (110558624).

221117242 is a wasteful number, since it uses less digits than its factorization.

221117242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110558623.

The product of its digits is 448, while the sum is 22.

The square root of 221117242 is about 14870.0114996593. The cubic root of 221117242 is about 604.7012545044.

Adding to 221117242 its reverse (242711122), we get a palindrome (463828364).

The spelling of 221117242 in words is "two hundred twenty-one million, one hundred seventeen thousand, two hundred forty-two".