221342542 has 16 divisors (see below), whose sum is σ = 343291392. Its totient is φ = 106923960.

The previous prime is 221342531. The next prime is 221342551. The reversal of 221342542 is 245243122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39733 + ... + 44959.

It is an arithmetic number, because the mean of its divisors is an integer number (21455712).

Almost surely, 2^221342542 is an apocalyptic number.

221342542 is a deficient number, since it is larger than the sum of its proper divisors (121948850).

221342542 is a wasteful number, since it uses less digits than its factorization.

221342542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943.

The product of its digits is 3840, while the sum is 25.

The square root of 221342542 is about 14877.5852207272. The cubic root of 221342542 is about 604.9065648117.

Adding to 221342542 its reverse (245243122), we get a palindrome (466585664).

The spelling of 221342542 in words is "two hundred twenty-one million, three hundred forty-two thousand, five hundred forty-two".