21550755067 has 4 divisors (see below), whose sum is σ = 21554134560. Its totient is φ = 21547375576.

The previous prime is 21550755013. The next prime is 21550755071. The reversal of 21550755067 is 76055705512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21550755067 - 2¹¹ = 21550753019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21550755097) 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 in 3 ways as a sum of consecutive naturals, for example, 1680163 + ... + 1692940.

It is an arithmetic number, because the mean of its divisors is an integer number (5388533640).

Almost surely, 2^21550755067 is an apocalyptic number.

21550755067 is a deficient number, since it is larger than the sum of its proper divisors (3379493).

21550755067 is an equidigital number, since it uses as much as digits as its factorization.

21550755067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379492.

The product of its (nonzero) digits is 367500, while the sum is 43.

The spelling of 21550755067 in words is "twenty-one billion, five hundred fifty million, seven hundred fifty-five thousand, sixty-seven".