20224124221 has 6 divisors (see below), whose sum is σ = 23526022110. Its totient is φ = 17334963576.

The previous prime is 20224124209. The next prime is 20224124269. The reversal of 20224124221 is 12242142202.

It can be written as a sum of positive squares in only one way, i.e., 17001291321 + 3222832900 = 130389^2 + 56770^2 .

It is not a de Polignac number, because 20224124221 - 2¹⁹ = 20223599933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20224124192 and 20224124201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20224124321) 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, 206368566 + ... + 206368663.

It is an arithmetic number, because the mean of its divisors is an integer number (3921003685).

Almost surely, 2^20224124221 is an apocalyptic number.

It is an amenable number.

20224124221 is a deficient number, since it is larger than the sum of its proper divisors (3301897889).

20224124221 is an equidigital number, since it uses as much as digits as its factorization.

20224124221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412737243 (or 412737236 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 20224124221 its reverse (12242142202), we get a palindrome (32466266423).

The spelling of 20224124221 in words is "twenty billion, two hundred twenty-four million, one hundred twenty-four thousand, two hundred twenty-one".