21107011 has 4 divisors (see below), whose sum is σ = 21259000. Its totient is φ = 20955024.

The previous prime is 21106997. The next prime is 21107017. The reversal of 21107011 is 11070112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21107011 - 2¹⁷ = 20975939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21106982 and 21107000.

It is not an unprimeable number, because it can be changed into a prime (21107017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75786 + ... + 76063.

It is an arithmetic number, because the mean of its divisors is an integer number (5314750).

Almost surely, 2^21107011 is an apocalyptic number.

21107011 is a deficient number, since it is larger than the sum of its proper divisors (151989).

21107011 is a wasteful number, since it uses less digits than its factorization.

21107011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151988.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 21107011 is about 4594.2367157124. The cubic root of 21107011 is about 276.3602512367.

Adding to 21107011 its reverse (11070112), we get a palindrome (32177123).

The spelling of 21107011 in words is "twenty-one million, one hundred seven thousand, eleven".