20240442420421 has 2 divisors, whose sum is σ = 20240442420422. Its totient is φ = 20240442420420.

The previous prime is 20240442420389. The next prime is 20240442420467. The reversal of 20240442420421 is 12402424404202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11369635428321 + 8870806992100 = 3371889^2 + 2978390^2 .

It is a cyclic number.

It is not a de Polignac number, because 20240442420421 - 2⁵ = 20240442420389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20240442420491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10120221210210 + 10120221210211.

It is an arithmetic number, because the mean of its divisors is an integer number (10120221210211).

Almost surely, 2^{20240442420421} is an apocalyptic number.

It is an amenable number.

20240442420421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20240442420421 is an equidigital number, since it uses as much as digits as its factorization.

20240442420421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 20240442420421 its reverse (12402424404202), we get a palindrome (32642866824623).

The spelling of 20240442420421 in words is "twenty trillion, two hundred forty billion, four hundred forty-two million, four hundred twenty thousand, four hundred twenty-one".