21710660429 has 2 divisors, whose sum is σ = 21710660430. Its totient is φ = 21710660428.

The previous prime is 21710660399. The next prime is 21710660443. The reversal of 21710660429 is 92406601712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11680637929 + 10030022500 = 108077^2 + 100150^2 .

It is a cyclic number.

It is not a de Polignac number, because 21710660429 - 2²⁰ = 21709611853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21710660392 and 21710660401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21710660029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855330214 + 10855330215.

It is an arithmetic number, because the mean of its divisors is an integer number (10855330215).

Almost surely, 2^21710660429 is an apocalyptic number.

It is an amenable number.

21710660429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21710660429 is an equidigital number, since it uses as much as digits as its factorization.

21710660429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 21710660429 in words is "twenty-one billion, seven hundred ten million, six hundred sixty thousand, four hundred twenty-nine".