21433442417 has 2 divisors, whose sum is σ = 21433442418. Its totient is φ = 21433442416.

The previous prime is 21433442341. The next prime is 21433442419. The reversal of 21433442417 is 71424433412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18476693041 + 2956749376 = 135929^2 + 54376^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433442417 - 2¹² = 21433438321 is a prime.

Together with 21433442419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21433442419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716721208 + 10716721209.

It is an arithmetic number, because the mean of its divisors is an integer number (10716721209).

Almost surely, 2^21433442417 is an apocalyptic number.

It is an amenable number.

21433442417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433442417 is an equidigital number, since it uses as much as digits as its factorization.

21433442417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 35.

Adding to 21433442417 its reverse (71424433412), we get a palindrome (92857875829).

The spelling of 21433442417 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty-two thousand, four hundred seventeen".