21407011 has 2 divisors, whose sum is σ = 21407012. Its totient is φ = 21407010.

The previous prime is 21406999. The next prime is 21407021. The reversal of 21407011 is 11070412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21407011 - 2⁷ = 21406883 is a prime.

It is not a weakly prime, because it can be changed into another prime (21407021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703505 + 10703506.

It is an arithmetic number, because the mean of its divisors is an integer number (10703506).

Almost surely, 2^21407011 is an apocalyptic number.

21407011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21407011 is an equidigital number, since it uses as much as digits as its factorization.

21407011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21407011 is about 4626.7711203387. The cubic root of 21407011 is about 277.6634256366.

Adding to 21407011 its reverse (11070412), we get a palindrome (32477423).

The spelling of 21407011 in words is "twenty-one million, four hundred seven thousand, eleven".