21224202523 has 2 divisors, whose sum is σ = 21224202524. Its totient is φ = 21224202522.

The previous prime is 21224202497. The next prime is 21224202547. The reversal of 21224202523 is 32520242212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21224202523 - 2⁹ = 21224202011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21224202563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612101261 + 10612101262.

It is an arithmetic number, because the mean of its divisors is an integer number (10612101262).

Almost surely, 2^21224202523 is an apocalyptic number.

21224202523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224202523 is an equidigital number, since it uses as much as digits as its factorization.

21224202523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21224202523 its reverse (32520242212), we get a palindrome (53744444735).

The spelling of 21224202523 in words is "twenty-one billion, two hundred twenty-four million, two hundred two thousand, five hundred twenty-three".