21425210501129 has 2 divisors, whose sum is σ = 21425210501130. Its totient is φ = 21425210501128.

The previous prime is 21425210501113. The next prime is 21425210501239. The reversal of 21425210501129 is 92110501252412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14422031593225 + 7003178907904 = 3797635^2 + 2646352^2 .

It is a cyclic number.

It is not a de Polignac number, because 21425210501129 - 2⁴ = 21425210501113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21425210501729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712605250564 + 10712605250565.

It is an arithmetic number, because the mean of its divisors is an integer number (10712605250565).

Almost surely, 2^{21425210501129} is an apocalyptic number.

It is an amenable number.

21425210501129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425210501129 is an equidigital number, since it uses as much as digits as its factorization.

21425210501129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 21425210501129 in words is "twenty-one trillion, four hundred twenty-five billion, two hundred ten million, five hundred one thousand, one hundred twenty-nine".