21302011 has 4 divisors (see below), whose sum is σ = 21513024. Its totient is φ = 21091000.

The previous prime is 21301997. The next prime is 21302027. The reversal of 21302011 is 11020312.

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 21302011 - 2¹⁵ = 21269243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21302051) 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 in 3 ways as a sum of consecutive naturals, for example, 105355 + ... + 105556.

It is an arithmetic number, because the mean of its divisors is an integer number (5378256).

Almost surely, 2^21302011 is an apocalyptic number.

21302011 is a deficient number, since it is larger than the sum of its proper divisors (211013).

21302011 is a wasteful number, since it uses less digits than its factorization.

21302011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211012.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21302011 is about 4615.4101659549. The cubic root of 21302011 is about 277.2087076745.

Adding to 21302011 its reverse (11020312), we get a palindrome (32322323).

The spelling of 21302011 in words is "twenty-one million, three hundred two thousand, eleven".