21653051446529 has 2 divisors, whose sum is σ = 21653051446530. Its totient is φ = 21653051446528.

The previous prime is 21653051446517. The next prime is 21653051446547. The reversal of 21653051446529 is 92564415035612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17225612640625 + 4427438805904 = 4150375^2 + 2104148^2 .

It is a cyclic number.

It is not a de Polignac number, because 21653051446529 - 2⁴⁰ = 20553539818753 is a prime.

It is a super-2 number, since 2×21653051446529² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21653051440529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826525723264 + 10826525723265.

It is an arithmetic number, because the mean of its divisors is an integer number (10826525723265).

Almost surely, 2^{21653051446529} is an apocalyptic number.

It is an amenable number.

21653051446529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21653051446529 is an equidigital number, since it uses as much as digits as its factorization.

21653051446529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The spelling of 21653051446529 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-one million, four hundred forty-six thousand, five hundred twenty-nine".