21507532021163 has 2 divisors, whose sum is σ = 21507532021164. Its totient is φ = 21507532021162.

The previous prime is 21507532021133. The next prime is 21507532021189. The reversal of 21507532021163 is 36112023570512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21507532021163 - 2⁶ = 21507532021099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21507532021133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753766010581 + 10753766010582.

It is an arithmetic number, because the mean of its divisors is an integer number (10753766010582).

Almost surely, 2^{21507532021163} is an apocalyptic number.

21507532021163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507532021163 is an equidigital number, since it uses as much as digits as its factorization.

21507532021163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 38.

Adding to 21507532021163 its reverse (36112023570512), we get a palindrome (57619555591675).

The spelling of 21507532021163 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, twenty-one thousand, one hundred sixty-three".