221145104 has 20 divisors (see below), whose sum is σ = 451020240. Its totient is φ = 104752800.

The previous prime is 221145101. The next prime is 221145109. The reversal of 221145104 is 401541122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221145101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363422 + ... + 364029.

It is an arithmetic number, because the mean of its divisors is an integer number (22551012).

Almost surely, 2^221145104 is an apocalyptic number.

It is an amenable number.

221145104 is an abundant number, since it is smaller than the sum of its proper divisors (229875136).

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

221145104 is a wasteful number, since it uses less digits than its factorization.

221145104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727478 (or 727472 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 221145104 is about 14870.9483221481. The cubic root of 221145104 is about 604.7266520094.

Adding to 221145104 its reverse (401541122), we get a palindrome (622686226).

The spelling of 221145104 in words is "two hundred twenty-one million, one hundred forty-five thousand, one hundred four".