21303142417 has 2 divisors, whose sum is σ = 21303142418. Its totient is φ = 21303142416.

The previous prime is 21303142411. The next prime is 21303142477. The reversal of 21303142417 is 71424130312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15236446096 + 6066696321 = 123436^2 + 77889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303142417 is a prime.

It is a super-4 number, since 4×21303142417⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21303142411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651571208 + 10651571209.

It is an arithmetic number, because the mean of its divisors is an integer number (10651571209).

Almost surely, 2^21303142417 is an apocalyptic number.

It is an amenable number.

21303142417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303142417 is an equidigital number, since it uses as much as digits as its factorization.

21303142417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

Adding to 21303142417 its reverse (71424130312), we get a palindrome (92727272729).

The spelling of 21303142417 in words is "twenty-one billion, three hundred three million, one hundred forty-two thousand, four hundred seventeen".