21712716229 has 2 divisors, whose sum is σ = 21712716230. Its totient is φ = 21712716228.

The previous prime is 21712716199. The next prime is 21712716269. The reversal of 21712716229 is 92261721712.

It is an a-pointer prime, because the next prime (21712716269) can be obtained adding 21712716229 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18995179329 + 2717536900 = 137823^2 + 52130^2 .

It is a cyclic number.

It is not a de Polignac number, because 21712716229 - 2³¹ = 19565232581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21712716191 and 21712716200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21712716269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10856358114 + 10856358115.

It is an arithmetic number, because the mean of its divisors is an integer number (10856358115).

Almost surely, 2^21712716229 is an apocalyptic number.

It is an amenable number.

21712716229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21712716229 is an equidigital number, since it uses as much as digits as its factorization.

21712716229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The spelling of 21712716229 in words is "twenty-one billion, seven hundred twelve million, seven hundred sixteen thousand, two hundred twenty-nine".