21045107 has 2 divisors, whose sum is σ = 21045108. Its totient is φ = 21045106.

The previous prime is 21045083. The next prime is 21045109. The reversal of 21045107 is 70154012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21045107 - 2¹² = 21041011 is a prime.

Together with 21045109, 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 (21045109) 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, 10522553 + 10522554.

It is an arithmetic number, because the mean of its divisors is an integer number (10522554).

Almost surely, 2^21045107 is an apocalyptic number.

21045107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21045107 is an equidigital number, since it uses as much as digits as its factorization.

21045107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21045107 is about 4587.4946321494. The cubic root of 21045107 is about 276.0898109668.

Adding to 21045107 its reverse (70154012), we get a palindrome (91199119).

The spelling of 21045107 in words is "twenty-one million, forty-five thousand, one hundred seven".