221425042 has 4 divisors (see below), whose sum is σ = 332137566. Its totient is φ = 110712520.

The previous prime is 221425021. The next prime is 221425079. The reversal of 221425042 is 240524122.

221425042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 221384641 + 40401 = 14879^2 + 201^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55356259 + ... + 55356262.

Almost surely, 2^221425042 is an apocalyptic number.

221425042 is a deficient number, since it is larger than the sum of its proper divisors (110712524).

221425042 is a wasteful number, since it uses less digits than its factorization.

221425042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110712523.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 221425042 is about 14880.3575897893. The cubic root of 221425042 is about 604.9817101681.

Adding to 221425042 its reverse (240524122), we get a palindrome (461949164).

The spelling of 221425042 in words is "two hundred twenty-one million, four hundred twenty-five thousand, forty-two".