21423320011 has 2 divisors, whose sum is σ = 21423320012. Its totient is φ = 21423320010.

The previous prime is 21423319999. The next prime is 21423320027. The reversal of 21423320011 is 11002332412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21423320011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21423320081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711660005 + 10711660006.

It is an arithmetic number, because the mean of its divisors is an integer number (10711660006).

Almost surely, 2^21423320011 is an apocalyptic number.

21423320011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423320011 is an equidigital number, since it uses as much as digits as its factorization.

21423320011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21423320011 its reverse (11002332412), we get a palindrome (32425652423).

The spelling of 21423320011 in words is "twenty-one billion, four hundred twenty-three million, three hundred twenty thousand, eleven".