21755567043299 has 2 divisors, whose sum is σ = 21755567043300. Its totient is φ = 21755567043298.

The previous prime is 21755567043283. The next prime is 21755567043307. The reversal of 21755567043299 is 99234076555712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21755567043299 - 2⁴ = 21755567043283 is a prime.

It is not a weakly prime, because it can be changed into another prime (21755567043209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10877783521649 + 10877783521650.

It is an arithmetic number, because the mean of its divisors is an integer number (10877783521650).

Almost surely, 2^{21755567043299} is an apocalyptic number.

21755567043299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21755567043299 is an equidigital number, since it uses as much as digits as its factorization.

21755567043299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884000, while the sum is 65.

The spelling of 21755567043299 in words is "twenty-one trillion, seven hundred fifty-five billion, five hundred sixty-seven million, forty-three thousand, two hundred ninety-nine".