221331042424 has 32 divisors (see below), whose sum is σ = 420748830000. Its totient is φ = 109131846912.

The previous prime is 221331042407. The next prime is 221331042461. The reversal of 221331042424 is 424240133122.

221331042424 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221331042392 and 221331042401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4030947 + ... + 4085485.

Almost surely, 2^221331042424 is an apocalyptic number.

It is an amenable number.

221331042424 is a deficient number, since it is larger than the sum of its proper divisors (199417787576).

221331042424 is a wasteful number, since it uses less digits than its factorization.

221331042424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61567 (or 61563 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 221331042424 its reverse (424240133122), we get a palindrome (645571175546).

The spelling of 221331042424 in words is "two hundred twenty-one billion, three hundred thirty-one million, forty-two thousand, four hundred twenty-four".