221552542 has 8 divisors (see below), whose sum is σ = 333255600. Its totient is φ = 110467344.

The previous prime is 221552519. The next prime is 221552543. The reversal of 221552542 is 245255122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221552542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221552543) by changing a digit.

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, 153567 + ... + 155002.

It is an arithmetic number, because the mean of its divisors is an integer number (41656950).

Almost surely, 2^221552542 is an apocalyptic number.

221552542 is a deficient number, since it is larger than the sum of its proper divisors (111703058).

221552542 is a wasteful number, since it uses less digits than its factorization.

221552542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308930.

The product of its digits is 8000, while the sum is 28.

The square root of 221552542 is about 14884.6411444818. The cubic root of 221552542 is about 605.0978071956.

The spelling of 221552542 in words is "two hundred twenty-one million, five hundred fifty-two thousand, five hundred forty-two".