221242104 has 40 divisors (see below), whose sum is σ = 619684560. Its totient is φ = 73747152.

The previous prime is 221242103. The next prime is 221242127. The reversal of 221242104 is 401242122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221242103) 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 9 ways as a sum of consecutive naturals, for example, 170064 + ... + 171359.

It is an arithmetic number, because the mean of its divisors is an integer number (15492114).

Almost surely, 2^221242104 is an apocalyptic number.

221242104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221242104 is an abundant number, since it is smaller than the sum of its proper divisors (398442456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221242104 is a wasteful number, since it uses less digits than its factorization.

221242104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341441 (or 341428 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221242104 is about 14874.2093571390. The cubic root of 221242104 is about 604.8150553697.

Adding to 221242104 its sum of digits (18), we get a palindrome (221242122).

Adding to 221242104 its reverse (401242122), we get a palindrome (622484226).

The spelling of 221242104 in words is "two hundred twenty-one million, two hundred forty-two thousand, one hundred four".