21230511566211 has 8 divisors (see below), whose sum is σ = 31452609727760. Its totient is φ = 14153674377456.

The previous prime is 21230511566207. The next prime is 21230511566261. The reversal of 21230511566211 is 11266511503212.

21230511566211 is a `hidden beast` number, since 2 + 1 + 2 + 30 + 51 + 1 + 566 + 2 + 11 = 666.

It is not a de Polignac number, because 21230511566211 - 2² = 21230511566207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230511566261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393157621570 + ... + 393157621623.

It is an arithmetic number, because the mean of its divisors is an integer number (3931576215970).

Almost surely, 2^{21230511566211} is an apocalyptic number.

21230511566211 is a deficient number, since it is larger than the sum of its proper divisors (10222098161549).

21230511566211 is an equidigital number, since it uses as much as digits as its factorization.

21230511566211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786315243202 (or 786315243196 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 21230511566211 in words is "twenty-one trillion, two hundred thirty billion, five hundred eleven million, five hundred sixty-six thousand, two hundred eleven".