221004242 has 4 divisors (see below), whose sum is σ = 331506366. Its totient is φ = 110502120.

The previous prime is 221004241. The next prime is 221004247. The reversal of 221004242 is 242400122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242400122 = 2 ⋅121200061.

It can be written as a sum of positive squares in only one way, i.e., 143017681 + 77986561 = 11959^2 + 8831^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221004242.

It is not an unprimeable number, because it can be changed into a prime (221004241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55251059 + ... + 55251062.

Almost surely, 2^221004242 is an apocalyptic number.

221004242 is a deficient number, since it is larger than the sum of its proper divisors (110502124).

221004242 is a wasteful number, since it uses less digits than its factorization.

221004242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110502123.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 221004242 is about 14866.2114205335. The cubic root of 221004242 is about 604.5982278861.

Adding to 221004242 its reverse (242400122), we get a palindrome (463404364).

The spelling of 221004242 in words is "two hundred twenty-one million, four thousand, two hundred forty-two".