221496807523 has 2 divisors, whose sum is σ = 221496807524. Its totient is φ = 221496807522.

The previous prime is 221496807451. The next prime is 221496807529. The reversal of 221496807523 is 325708694122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221496807523 is a prime.

It is not a weakly prime, because it can be changed into another prime (221496807529) 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, 110748403761 + 110748403762.

It is an arithmetic number, because the mean of its divisors is an integer number (110748403762).

It is a 1-persistent number, because it is pandigital, but 2⋅221496807523 = 442993615046 is not.

Almost surely, 2^221496807523 is an apocalyptic number.

221496807523 is a deficient number, since it is larger than the sum of its proper divisors (1).

221496807523 is an equidigital number, since it uses as much as digits as its factorization.

221496807523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 221496807523 in words is "two hundred twenty-one billion, four hundred ninety-six million, eight hundred seven thousand, five hundred twenty-three".