21735563551489 has 2 divisors, whose sum is σ = 21735563551490. Its totient is φ = 21735563551488.

The previous prime is 21735563551421. The next prime is 21735563551517. The reversal of 21735563551489 is 98415536553712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21520924074225 + 214639477264 = 4639065^2 + 463292^2 .

It is a cyclic number.

It is not a de Polignac number, because 21735563551489 - 2¹⁹ = 21735563027201 is a prime.

It is a super-2 number, since 2×21735563551489² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21735563551489.

It is not a weakly prime, because it can be changed into another prime (21735563551409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867781775744 + 10867781775745.

It is an arithmetic number, because the mean of its divisors is an integer number (10867781775745).

Almost surely, 2^{21735563551489} is an apocalyptic number.

It is an amenable number.

21735563551489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21735563551489 is an equidigital number, since it uses as much as digits as its factorization.

21735563551489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080000, while the sum is 64.

The spelling of 21735563551489 in words is "twenty-one trillion, seven hundred thirty-five billion, five hundred sixty-three million, five hundred fifty-one thousand, four hundred eighty-nine".