21150567653 has 2 divisors, whose sum is σ = 21150567654. Its totient is φ = 21150567652.

The previous prime is 21150567577. The next prime is 21150567671. The reversal of 21150567653 is 35676505112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20719299364 + 431268289 = 143942^2 + 20767^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150567653 - 2¹⁶ = 21150502117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21150567653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150567673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575283826 + 10575283827.

It is an arithmetic number, because the mean of its divisors is an integer number (10575283827).

Almost surely, 2^21150567653 is an apocalyptic number.

It is an amenable number.

21150567653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150567653 is an equidigital number, since it uses as much as digits as its factorization.

21150567653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 41.

The spelling of 21150567653 in words is "twenty-one billion, one hundred fifty million, five hundred sixty-seven thousand, six hundred fifty-three".