221224304421 has 6 divisors (see below), whose sum is σ = 319546217510. Its totient is φ = 147482869608.

The previous prime is 221224304393. The next prime is 221224304423. The reversal of 221224304421 is 124403422122.

It is a happy number.

221224304421 is a `hidden beast` number, since 2 + 212 + 2 + 4 + 3 + 0 + 442 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 203770988100 + 17453316321 = 451410^2 + 132111^2 .

It is not a de Polignac number, because 221224304421 - 2⁷ = 221224304293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221224304423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12290239126 + ... + 12290239143.

Almost surely, 2^221224304421 is an apocalyptic number.

It is an amenable number.

221224304421 is a deficient number, since it is larger than the sum of its proper divisors (98321913089).

221224304421 is a wasteful number, since it uses less digits than its factorization.

221224304421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24580478275 (or 24580478272 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 221224304421 its reverse (124403422122), we get a palindrome (345627726543).

The spelling of 221224304421 in words is "two hundred twenty-one billion, two hundred twenty-four million, three hundred four thousand, four hundred twenty-one".