21224496317 has 2 divisors, whose sum is σ = 21224496318. Its totient is φ = 21224496316.

The previous prime is 21224496287. The next prime is 21224496427. The reversal of 21224496317 is 71369442212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16524845401 + 4699650916 = 128549^2 + 68554^2 .

It is a cyclic number.

It is not a de Polignac number, because 21224496317 - 2¹⁰ = 21224495293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21224496217) 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, 10612248158 + 10612248159.

It is an arithmetic number, because the mean of its divisors is an integer number (10612248159).

Almost surely, 2^21224496317 is an apocalyptic number.

It is an amenable number.

21224496317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224496317 is an equidigital number, since it uses as much as digits as its factorization.

21224496317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The spelling of 21224496317 in words is "twenty-one billion, two hundred twenty-four million, four hundred ninety-six thousand, three hundred seventeen".