521223535243 has 2 divisors, whose sum is σ = 521223535244. Its totient is φ = 521223535242.

The previous prime is 521223535229. The next prime is 521223535271. The reversal of 521223535243 is 342535322125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521223535243 - 2¹³ = 521223527051 is a prime.

It is not a weakly prime, because it can be changed into another prime (521223535843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260611767621 + 260611767622.

It is an arithmetic number, because the mean of its divisors is an integer number (260611767622).

Almost surely, 2^521223535243 is an apocalyptic number.

521223535243 is a deficient number, since it is larger than the sum of its proper divisors (1).

521223535243 is an equidigital number, since it uses as much as digits as its factorization.

521223535243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216000, while the sum is 37.

Adding to 521223535243 its reverse (342535322125), we get a palindrome (863758857368).

It can be divided in two parts, 52 and 1223535243, that multiplied together give a palindrome (63623832636).

The spelling of 521223535243 in words is "five hundred twenty-one billion, two hundred twenty-three million, five hundred thirty-five thousand, two hundred forty-three".