20424044213021 has 2 divisors, whose sum is σ = 20424044213022. Its totient is φ = 20424044213020.

The previous prime is 20424044213009. The next prime is 20424044213063. The reversal of 20424044213021 is 12031244042402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19663859016025 + 760185196996 = 4434395^2 + 871886^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424044213021 - 2¹⁴ = 20424044196637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424044216021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212022106510 + 10212022106511.

It is an arithmetic number, because the mean of its divisors is an integer number (10212022106511).

Almost surely, 2^{20424044213021} is an apocalyptic number.

It is an amenable number.

20424044213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424044213021 is an equidigital number, since it uses as much as digits as its factorization.

20424044213021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 20424044213021 its reverse (12031244042402), we get a palindrome (32455288255423).

The spelling of 20424044213021 in words is "twenty trillion, four hundred twenty-four billion, forty-four million, two hundred thirteen thousand, twenty-one".