221535542 has 16 divisors (see below), whose sum is σ = 334962432. Its totient is φ = 109885440.

The previous prime is 221535533. The next prime is 221535569. The reversal of 221535542 is 245535122.

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, 149867 + ... + 151337.

It is an arithmetic number, because the mean of its divisors is an integer number (20935152).

Almost surely, 2^221535542 is an apocalyptic number.

221535542 is a deficient number, since it is larger than the sum of its proper divisors (113426890).

221535542 is a wasteful number, since it uses less digits than its factorization.

221535542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its digits is 12000, while the sum is 29.

The square root of 221535542 is about 14884.0700750836. The cubic root of 221535542 is about 605.0823301659.

The spelling of 221535542 in words is "two hundred twenty-one million, five hundred thirty-five thousand, five hundred forty-two".