21525633652529 has 2 divisors, whose sum is σ = 21525633652530. Its totient is φ = 21525633652528.

The previous prime is 21525633652483. The next prime is 21525633652543. The reversal of 21525633652529 is 92525633652512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17768037496225 + 3757596156304 = 4215215^2 + 1938452^2 .

It is a cyclic number.

It is not a de Polignac number, because 21525633652529 - 2¹² = 21525633648433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21525633652559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762816826264 + 10762816826265.

It is an arithmetic number, because the mean of its divisors is an integer number (10762816826265).

Almost surely, 2^{21525633652529} is an apocalyptic number.

It is an amenable number.

21525633652529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21525633652529 is an equidigital number, since it uses as much as digits as its factorization.

21525633652529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160000, while the sum is 56.

The spelling of 21525633652529 in words is "twenty-one trillion, five hundred twenty-five billion, six hundred thirty-three million, six hundred fifty-two thousand, five hundred twenty-nine".