21222031543523 has 2 divisors, whose sum is σ = 21222031543524. Its totient is φ = 21222031543522.

The previous prime is 21222031543481. The next prime is 21222031543567. The reversal of 21222031543523 is 32534513022212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222031543523 - 2¹⁸ = 21222031281379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222531543523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611015771761 + 10611015771762.

It is an arithmetic number, because the mean of its divisors is an integer number (10611015771762).

Almost surely, 2^{21222031543523} is an apocalyptic number.

21222031543523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222031543523 is an equidigital number, since it uses as much as digits as its factorization.

21222031543523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21222031543523 its reverse (32534513022212), we get a palindrome (53756544565735).

The spelling of 21222031543523 in words is "twenty-one trillion, two hundred twenty-two billion, thirty-one million, five hundred forty-three thousand, five hundred twenty-three".