21594712429 has 2 divisors, whose sum is σ = 21594712430. Its totient is φ = 21594712428.

The previous prime is 21594712361. The next prime is 21594712441. The reversal of 21594712429 is 92421749512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17937244900 + 3657467529 = 133930^2 + 60477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21594712429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21594752429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10797356214 + 10797356215.

It is an arithmetic number, because the mean of its divisors is an integer number (10797356215).

Almost surely, 2^21594712429 is an apocalyptic number.

It is an amenable number.

21594712429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21594712429 is an equidigital number, since it uses as much as digits as its factorization.

21594712429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The spelling of 21594712429 in words is "twenty-one billion, five hundred ninety-four million, seven hundred twelve thousand, four hundred twenty-nine".