221516242 has 8 divisors (see below), whose sum is σ = 332573616. Its totient is φ = 110658372.

The previous prime is 221516227. The next prime is 221516249. The reversal of 221516242 is 242615122.

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

It is not an unprimeable number, because it can be changed into a prime (221516249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47068 + ... + 51559.

It is an arithmetic number, because the mean of its divisors is an integer number (41571702).

Almost surely, 2^221516242 is an apocalyptic number.

221516242 is a deficient number, since it is larger than the sum of its proper divisors (111057374).

221516242 is a wasteful number, since it uses less digits than its factorization.

221516242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99752.

The product of its digits is 1920, while the sum is 25.

The square root of 221516242 is about 14883.4217167962. The cubic root of 221516242 is about 605.0647582253.

The spelling of 221516242 in words is "two hundred twenty-one million, five hundred sixteen thousand, two hundred forty-two".