21960011 has 2 divisors, whose sum is σ = 21960012. Its totient is φ = 21960010.

The previous prime is 21960007. The next prime is 21960013. The reversal of 21960011 is 11006912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21960011 - 2² = 21960007 is a prime.

Together with 21960013, 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 (21960013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10980005 + 10980006.

It is an arithmetic number, because the mean of its divisors is an integer number (10980006).

Almost surely, 2^21960011 is an apocalyptic number.

21960011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21960011 is an equidigital number, since it uses as much as digits as its factorization.

21960011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 21960011 is about 4686.1509792152. The cubic root of 21960011 is about 280.0340562317.

Adding to 21960011 its reverse (11006912), we get a palindrome (32966923).

The spelling of 21960011 in words is "twenty-one million, nine hundred sixty thousand, eleven".