21112012841 has 2 divisors, whose sum is σ = 21112012842. Its totient is φ = 21112012840.

The previous prime is 21112012837. The next prime is 21112012843. The reversal of 21112012841 is 14821021112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10877655616 + 10234357225 = 104296^2 + 101165^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112012841 - 2² = 21112012837 is a prime.

Together with 21112012843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21112012843) 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 as a sum of consecutive naturals, namely, 10556006420 + 10556006421.

It is an arithmetic number, because the mean of its divisors is an integer number (10556006421).

Almost surely, 2^21112012841 is an apocalyptic number.

It is an amenable number.

21112012841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112012841 is an equidigital number, since it uses as much as digits as its factorization.

21112012841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 21112012841 its reverse (14821021112), we get a palindrome (35933033953).

The spelling of 21112012841 in words is "twenty-one billion, one hundred twelve million, twelve thousand, eight hundred forty-one".