21692489717429 has 2 divisors, whose sum is σ = 21692489717430. Its totient is φ = 21692489717428.

The previous prime is 21692489717363. The next prime is 21692489717441. The reversal of 21692489717429 is 92471798429612.

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., 17023009551025 + 4669480166404 = 4125895^2 + 2160898^2 .

It is a cyclic number.

It is not a de Polignac number, because 21692489717429 - 2³⁶ = 21623770240693 is a prime.

It is a super-2 number, since 2×21692489717429² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21692489713429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10846244858714 + 10846244858715.

It is an arithmetic number, because the mean of its divisors is an integer number (10846244858715).

Almost surely, 2^{21692489717429} is an apocalyptic number.

It is an amenable number.

21692489717429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21692489717429 is an equidigital number, since it uses as much as digits as its factorization.

21692489717429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 71.

The spelling of 21692489717429 in words is "twenty-one trillion, six hundred ninety-two billion, four hundred eighty-nine million, seven hundred seventeen thousand, four hundred twenty-nine".