20042231523397 has 2 divisors, whose sum is σ = 20042231523398. Its totient is φ = 20042231523396.

The previous prime is 20042231523371. The next prime is 20042231523427. The reversal of 20042231523397 is 79332513224002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16065234357316 + 3976997166081 = 4008146^2 + 1994241^2 .

It is a cyclic number.

It is not a de Polignac number, because 20042231523397 - 2¹⁵ = 20042231490629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20042231521397) 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, 10021115761698 + 10021115761699.

It is an arithmetic number, because the mean of its divisors is an integer number (10021115761699).

Almost surely, 2^{20042231523397} is an apocalyptic number.

It is an amenable number.

20042231523397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042231523397 is an equidigital number, since it uses as much as digits as its factorization.

20042231523397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 43.

Adding to 20042231523397 its reverse (79332513224002), we get a palindrome (99374744747399).

The spelling of 20042231523397 in words is "twenty trillion, forty-two billion, two hundred thirty-one million, five hundred twenty-three thousand, three hundred ninety-seven".