21041107 has 2 divisors, whose sum is σ = 21041108. Its totient is φ = 21041106.

The previous prime is 21041099. The next prime is 21041117. The reversal of 21041107 is 70114012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041107 - 2³ = 21041099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520553 + 10520554.

It is an arithmetic number, because the mean of its divisors is an integer number (10520554).

Almost surely, 2^21041107 is an apocalyptic number.

21041107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041107 is an equidigital number, since it uses as much as digits as its factorization.

21041107 is an evil number, because the sum of its binary digits is even.

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

The square root of 21041107 is about 4587.0586436190. The cubic root of 21041107 is about 276.0723179185.

Adding to 21041107 its reverse (70114012), we get a palindrome (91155119).

The spelling of 21041107 in words is "twenty-one million, forty-one thousand, one hundred seven".