20242315421 has 2 divisors, whose sum is σ = 20242315422. Its totient is φ = 20242315420.

The previous prime is 20242315393. The next prime is 20242315447. The reversal of 20242315421 is 12451324202.

It is an a-pointer prime, because the next prime (20242315447) can be obtained adding 20242315421 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12670879225 + 7571436196 = 112565^2 + 87014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20242315421 - 2²² = 20238121117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20242315921) 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 as a sum of consecutive naturals, namely, 10121157710 + 10121157711.

It is an arithmetic number, because the mean of its divisors is an integer number (10121157711).

Almost surely, 2^20242315421 is an apocalyptic number.

It is an amenable number.

20242315421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20242315421 is an equidigital number, since it uses as much as digits as its factorization.

20242315421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 20242315421 its reverse (12451324202), we get a palindrome (32693639623).

The spelling of 20242315421 in words is "twenty billion, two hundred forty-two million, three hundred fifteen thousand, four hundred twenty-one".