21050056522067 has 4 divisors (see below), whose sum is σ = 21729090603456. Its totient is φ = 20371022440680.

The previous prime is 21050056522063. The next prime is 21050056522069. The reversal of 21050056522067 is 76022565005012.

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 21050056522067 - 2² = 21050056522063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21050056522063) 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 in 3 ways as a sum of consecutive naturals, for example, 339517040648 + ... + 339517040709.

It is an arithmetic number, because the mean of its divisors is an integer number (5432272650864).

Almost surely, 2^{21050056522067} is an apocalyptic number.

21050056522067 is a deficient number, since it is larger than the sum of its proper divisors (679034081389).

21050056522067 is an equidigital number, since it uses as much as digits as its factorization.

21050056522067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679034081388.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 21050056522067 in words is "twenty-one trillion, fifty billion, fifty-six million, five hundred twenty-two thousand, sixty-seven".