221210042 has 8 divisors (see below), whose sum is σ = 331879296. Its totient is φ = 110583612.

The previous prime is 221210009. The next prime is 221210051. The reversal of 221210042 is 240012122.

221210042 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 221209999 and 221210026.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11063 + ... + 23765.

It is an arithmetic number, because the mean of its divisors is an integer number (41484912).

Almost surely, 2^221210042 is an apocalyptic number.

221210042 is a deficient number, since it is larger than the sum of its proper divisors (110669254).

221210042 is a wasteful number, since it uses less digits than its factorization.

221210042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21412.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221210042 is about 14873.1315465170. The cubic root of 221210042 is about 604.7858377287.

Adding to 221210042 its reverse (240012122), we get a palindrome (461222164).

The spelling of 221210042 in words is "two hundred twenty-one million, two hundred ten thousand, forty-two".