21322450417 has 2 divisors, whose sum is σ = 21322450418. Its totient is φ = 21322450416.

The previous prime is 21322450339. The next prime is 21322450441. The reversal of 21322450417 is 71405422312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14683622976 + 6638827441 = 121176^2 + 81479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21322450417 is a prime.

It is not a weakly prime, because it can be changed into another prime (21322450217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661225208 + 10661225209.

It is an arithmetic number, because the mean of its divisors is an integer number (10661225209).

Almost surely, 2^21322450417 is an apocalyptic number.

It is an amenable number.

21322450417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322450417 is an equidigital number, since it uses as much as digits as its factorization.

21322450417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 21322450417 its reverse (71405422312), we get a palindrome (92727872729).

The spelling of 21322450417 in words is "twenty-one billion, three hundred twenty-two million, four hundred fifty thousand, four hundred seventeen".