221423042 has 8 divisors (see below), whose sum is σ = 340235532. Its totient is φ = 108011200.

The previous prime is 221423023. The next prime is 221423071. The reversal of 221423042 is 240324122.

It can be written as a sum of positive squares in 2 ways, for example, as 148815601 + 72607441 = 12199^2 + 8521^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350059 + ... + 1350222.

Almost surely, 2^221423042 is an apocalyptic number.

221423042 is a deficient number, since it is larger than the sum of its proper divisors (118812490).

221423042 is a wasteful number, since it uses less digits than its factorization.

221423042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700324.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 221423042 is about 14880.2903869515. The cubic root of 221423042 is about 604.9798886833.

Adding to 221423042 its reverse (240324122), we get a palindrome (461747164).

The spelling of 221423042 in words is "two hundred twenty-one million, four hundred twenty-three thousand, forty-two".