21111477067 has 2 divisors, whose sum is σ = 21111477068. Its totient is φ = 21111477066.

The previous prime is 21111477019. The next prime is 21111477109. The reversal of 21111477067 is 76077411112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111477067 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111477017) 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 as a sum of consecutive naturals, namely, 10555738533 + 10555738534.

It is an arithmetic number, because the mean of its divisors is an integer number (10555738534).

Almost surely, 2^21111477067 is an apocalyptic number.

21111477067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111477067 is an equidigital number, since it uses as much as digits as its factorization.

21111477067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 37.

Adding to 21111477067 its reverse (76077411112), we get a palindrome (97188888179).

The spelling of 21111477067 in words is "twenty-one billion, one hundred eleven million, four hundred seventy-seven thousand, sixty-seven".