21737245129 has 2 divisors, whose sum is σ = 21737245130. Its totient is φ = 21737245128.

The previous prime is 21737245091. The next prime is 21737245157. The reversal of 21737245129 is 92154273712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19733787529 + 2003457600 = 140477^2 + 44760^2 .

It is a cyclic number.

It is not a de Polignac number, because 21737245129 - 2²³ = 21728856521 is a prime.

It is not a weakly prime, because it can be changed into another prime (21737245199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10868622564 + 10868622565.

It is an arithmetic number, because the mean of its divisors is an integer number (10868622565).

Almost surely, 2^21737245129 is an apocalyptic number.

It is an amenable number.

21737245129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21737245129 is an equidigital number, since it uses as much as digits as its factorization.

21737245129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The spelling of 21737245129 in words is "twenty-one billion, seven hundred thirty-seven million, two hundred forty-five thousand, one hundred twenty-nine".