21433423717 has 2 divisors, whose sum is σ = 21433423718. Its totient is φ = 21433423716.

The previous prime is 21433423699. The next prime is 21433423723. The reversal of 21433423717 is 71732433412.

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., 12806543556 + 8626880161 = 113166^2 + 92881^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433423717 - 2²³ = 21425035109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21433424717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716711858 + 10716711859.

It is an arithmetic number, because the mean of its divisors is an integer number (10716711859).

Almost surely, 2^21433423717 is an apocalyptic number.

It is an amenable number.

21433423717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433423717 is an equidigital number, since it uses as much as digits as its factorization.

21433423717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 37.

The spelling of 21433423717 in words is "twenty-one billion, four hundred thirty-three million, four hundred twenty-three thousand, seven hundred seventeen".