20024224021 has 2 divisors, whose sum is σ = 20024224022. Its totient is φ = 20024224020.

The previous prime is 20024224019. The next prime is 20024224063. The reversal of 20024224021 is 12042242002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11520802225 + 8503421796 = 107335^2 + 92214^2 .

It is a cyclic number.

It is not a de Polignac number, because 20024224021 - 2¹ = 20024224019 is a prime.

Together with 20024224019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20024224021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20024224091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10012112010 + 10012112011.

It is an arithmetic number, because the mean of its divisors is an integer number (10012112011).

Almost surely, 2^20024224021 is an apocalyptic number.

It is an amenable number.

20024224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20024224021 is an equidigital number, since it uses as much as digits as its factorization.

20024224021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 20024224021 its reverse (12042242002), we get a palindrome (32066466023).

The spelling of 20024224021 in words is "twenty billion, twenty-four million, two hundred twenty-four thousand, twenty-one".