221241424221 has 16 divisors (see below), whose sum is σ = 327878094720. Its totient is φ = 147443423040.

The previous prime is 221241424219. The next prime is 221241424223. The reversal of 221241424221 is 122424142122.

221241424221 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 414 + 24 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (221241424219) and next prime (221241424223).

It is not a de Polignac number, because 221241424221 - 2¹ = 221241424219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221241424223) 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 15 ways as a sum of consecutive naturals, for example, 1332940 + ... + 1489701.

It is an arithmetic number, because the mean of its divisors is an integer number (20492380920).

Almost surely, 2^221241424221 is an apocalyptic number.

It is an amenable number.

221241424221 is a deficient number, since it is larger than the sum of its proper divisors (106636670499).

221241424221 is a wasteful number, since it uses less digits than its factorization.

221241424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825553 (or 2825547 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

Adding to 221241424221 its reverse (122424142122), we get a palindrome (343665566343).

The spelling of 221241424221 in words is "two hundred twenty-one billion, two hundred forty-one million, four hundred twenty-four thousand, two hundred twenty-one".