221000242 has 8 divisors (see below), whose sum is σ = 342931500. Its totient is φ = 106689744.

The previous prime is 221000141. The next prime is 221000243. The reversal of 221000242 is 242000122.

It can be written as a sum of positive squares in 2 ways, for example, as 215473041 + 5527201 = 14679^2 + 2351^2 .

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

It is a super-2 number, since 2×221000242² = 97682213928117128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221000243) 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, 1905117 + ... + 1905232.

Almost surely, 2^221000242 is an apocalyptic number.

221000242 is a deficient number, since it is larger than the sum of its proper divisors (121931258).

221000242 is a wasteful number, since it uses less digits than its factorization.

221000242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810380.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 221000242 is about 14866.0768866571. The cubic root of 221000242 is about 604.5945802827.

Adding to 221000242 its reverse (242000122), we get a palindrome (463000364).

The spelling of 221000242 in words is "two hundred twenty-one million, two hundred forty-two", and thus it is an aban number.